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linked materials: Books
skill level: groundwork popularity: energetic
budget friendly: $400 (shortest tune)
summary:For Mac OS X technical coordinators and entry-level device administrators who've a groundwork in Mac OS X and Mac OS X Server core functionality and an potential to configure key services and office simple troubleshooting of the essential Mac OS X and Mac OS X Server capabilities.
preliminary necessities:You should circulate two tests ($200 each and every). the first exam is Mac OS X assist essentials (passing this examination by myself will earn you an Apple licensed back professional certification aka ACSP). The 2nd examination is Mac OS X Server necessities. practising is purchasable but not required.
carrying on with requirements:None particular
Offline elements:Apple iServices presents instructor led lessons to aid you keep together.
See whole Apple Certifications
dealer's page for this certification
When it comes to Intel Macs, the best circumstance of portability not holds genuine. Apple definitely ships Intel Macs with an Intel-native edition of Mac OS X and considerations part Mac OS X updates for Intel Macs. which you can perceive facts by using searching on the build numbers between Mac OS X releases on Intel and vigour computing device Macs. youngsters two Macs might possibly breathe operating Mac OS X 10.4.6 with the latest security updates, the build numbers for the OS X free up will loom to breathe 8I1119 and 81127, respectively.
This might reach as a shock because Apple has indicated that whole the software that comes bundled with a new Mac is classic (it truly is, it consists of the code vital to Hurry natively on each power laptop and Intel Macs). even though it is true for just about whole applications and utilities that ship with Mac OS X (Safari, TextEdit, iTunes, and the different iLife and iWork applications), it isn't bona fide of the entire operating device. There are elements of Mac OS X which are certain to Intel or verve laptop hardware. most of these data seem enjoy tackle drivers and kernel extensions.
This throws a wrench into the view of the usage of a lone Mac OS X photo as a deployment alternative in a community that includes both Intel and power laptop Macs. basically, at present, Apple has formally brought up that it doesn't aid the introduction of a time-honored Mac OS X version by pass of cease clients. however, Apple has too indicated that it does method to finally reintegrate both Intel and verve laptop adaptations of the working gadget into a lone release (although unconfirmed, many foretell that this could ensue in Mac OS X 10.5, a.ok.a. Leopard). however, here's no longer the only difference that exists between Intel and verve workstation Macs that beget an sequel on the potential to create a chummy photograph that can too breathe used for deployment to both forms of machines.
besides the fact that children I’ve been aiding Macs considering the fact that they got here out in 1984 (when i used to breathe in tall college), I haven’t obtained any “formal” practising. It has ordinarily been researching by using doing, reading the occasional booklet and now of direction, TheAppleBlog. Does formal certification really Make a difference as a technician? You inform me.advertisement
recently I bought into an argument with a supplier that one pass or the other notion a technician who first started repairing Macs sixth months in the past trumped my 25 years journey. Did certification Make this adult a stronger technician? Having executed a little slightly of hiring myself, I’ve too often create that certification most efficient verifies your capability to assume a test and might now not beget demeanor within the actual world.
Now that the market has modified and everyone seems to breathe competing for scarce components, possibly a certification would breathe an further aspect? What’s the company approach for unbiased Mac technicians looking greater? The retort took loads of research — even Apple wasn’t in a position to retort my questions — so study from my experience.
credit score goes to each Brian best of BestMacs and Doug Hanley of MacTEK practicing, because without them I wouldn’t remember the alphabet soup of ACSP, ACMT, ACTC, ACSA, AASP, ACN and more. Didn’t whole of us develop into Mac users to remain away from arcane phrases? As lots of you understand, the benefit of the Apple consumer interface is equalled handiest by means of the frustration of trying to breathe mindful Apple’s certifications courses. figuring out this direction was an poor lot harder than any video video game I’ve ever performed, however a “game” may well breathe the optimum metaphor to interpret the system.The game
You start the “online game” as a common Mac consumer. The three worlds you’ll frequently perceive in the online game are IT, seasoned Apps, and revenue. As an IT grownup might breathe you beget got advantage, might breathe you don’t. Nothing stops you from effectively repairing Macs on your own, until you achieve things that principally void the warranty and you obtain caught doing so. You will not beget authorization per se from Apple to work on Macs. Many folks are delighted at this flush accumulating cash separately, but which you could’t proceed any extra until you obtain a certification — the key that unlocks the next stage in the online game.
the first certification most ebb for is Apple certified back professional (ACSP) which was once called an Apple certified assist Desk professional (ACHDS). This certifies your potential to bear in mind the operating tackle and is earned in line with the OS edition. therefore, you are an Apple certified back skilled in 10.5 (or quickly 10.6). every OS requires certification, but your certification does not expire. for this reason, if you are a ACHDS in 10.three, you could denomination your self licensed with out realizing 10.5 at all. Your can assume the check without working towards (many do), self-analyze by pass of materials from Peachpit, or attend an instructor-lead course at an Apple approved working towards middle (AATC). MacTek is a benevolent of centers. You’ll assume the check at a Prometric testing focus and pay round $200. The verify takes about 90 minutes or so and you obtain the effects automatically.Apple Consultants network
whereas certification is the capability, the conclusion you could breathe reaching for is the skill to breathe Part of the Apple Consultants network (ACN). becoming a member of the ACN requires any Apple certification, such as the ACSP mentioned above, or any variety of other certifications (described under, though one source says now not whole certifications are valid, so watch out). retaining with the video video game analogy, the ACN is enjoy a whole new zone of the video online game you want to discover, but the boss that beget to breathe defeated first is Apple, and your weapon is a certification!
After getting a certification you can then rehearse to breathe a Part of the ACN. The application payment is $60 and the precise payment to associate is $395 as a sole proprietor. the entire requirements are right here. You’ll obtain a lot of merits corresponding to product discounts as smartly as the faculty to community with other Macintosh consultants. As an ACN, Apple hold employees may additionally hand out your card to clients within the shop. Now your enterprise can in fact extend as each Apple store client is a potential customer for you.
ACN membership is excellent and a lot of live at this stage of the “game” the usage of the ACN membership as a multiplier for their revenue. youngsters, you nonetheless can’t achieve hardware repairs under assurance nor order Apple parts. As with the video video game, you’re stuck at this stage unless you explore further and assume a study at to defeat the subsequent boss. Apple always controls the guidelines. accept it as a Part of the video game. Fail to accept it and too you’ll obtain slapped lower back to the starting of the video game sooner than that you could click on the home button.Server Administration Certification
From this point, you've got a couple instructions that you may go. that you would breathe able to focal point on restore and service, or you can focus on server or superior application administration (many individuals will achieve both). i will talk about the server administration certifications and the hardware features certifications. that you may suppose of each and every of these as two part worlds within the game. that you can select one or the other, or discover them both.
the first stage server administration certification is one other four-letter acronym: ACTC: Apple licensed Technical Coordinator. apart from passing the examine for ACSP, you’ll face the Server essentials test. This extends your notebook expertise to servers. an excellent greater degree of certification in the server realm is an ACSA — Apple certified techniques Administrator. For the ACSA, you’ll deserve to tide 4 tests: Server essentials, directory features, Deployment, and Mobility and security for 10.6 (or superior device Administration for 10.5).
Apple too offers the ACMA (Apple licensed Media Administrator) which contains Server necessities, Xsan, final reduce Server and as an alternative, assist necessities, Deployment, directory functions, or ultimate gash degree 1. other certifications aren't necessarily IT linked and are software-concentrated. That’s a realm I’m no longer exploring as they chose the IT track at the mount of the online game.Hardware fix Certification
relocating on from server administration to exact Apple hardware fix, the basic certification you are going to earn is the Apple licensed Macintosh Technician (ACMT), formerly the Apple licensed moveable Technician (ACPT) and Apple certified computing device Technician (ACDT). This certification capability you are theoretically certified to achieve assurance repairs on Apple Macintosh device. The expertise required for ACMT are those of hardware repair and utility troubleshooting. You don’t need an ACSP to breathe an ACMT, however many people earn each. The tutorial manner for hardware repair is greater unreasonable and it’s less probably you’ll tide the examine with out some practicing. At this degree, that you may additionally ebb to an AATC and pay about $four,800 for both the hardware and utility features of the path, or your should buy self-study materials from Apple known as “Apple supervision Technician practicing” for $299.Apple licensed service provider
similar to how passing the ACSP means that you can associate the Apple Consultants network, passing the ACMT allows you to enter the realm of an Apple authorized carrier provider (AASP). You may additionally now not immediately become one though, and only AASP’s obtain compensation from Apple for warranty work. youngsters, being an ACMT is terribly helpful in case you wish to obtain a job as an AASP. You might too additionally rehearse to achieve warranty repairs on your larger corporation of over 50 Macs via the Self-service software. in case you wish to enhance to being in a position to achieve warranty repairs for any one, you’ll face that equal boss once again, Apple. note that becoming an ACMT will now not always earn you from now on cash than an ACSA or ACTC. facing the subsequent boss may well breathe too costly and too restricting, but when you achieve desire the subsequent degree, examine on.
getting to that AASP flush is in reality the ultimate stage of the video game. You’ll should beget an ACMT on staff and comply with stricter requirements than joining the Apple Consultants network. often you’ll need a true store front and not breathe a one-grownup operation. Apple provides exceptions (doesn’t every video game beget cheat codes?), however don’t signify number on it. after getting your AASP you can breathe listed with Apple as a provider company and obtain reimbursed for warranty repairs.
So I’ve loaded the online game and pressed delivery. Is certification value it? What about ACN or AASP? Which practicing may still i ebb for? Is teacher lead practicing price it? Any working towards vendors willing to sponsor me? What concerning the self-look at classes? participate with me your experiences within the online game and let’s improve a definitive lead together with “cheat codes.”Apple-authorized agencies
ACN (Apple Consultants network)What it is: community on Apple gurus, receives discounts and assistance from Apple, and can breathe referred from Apple retail outlets.requirements: Any certification.
AASP (Apple licensed provider company)what is it: company it truly is permitted to achieve Apple assurance repairs for compensation and order parts from Apple.necessities: beget an Apple licensed Macintosh Technician on team of workers, among other requirements.Certifications
Apple certified aid professional: primary knowing of the client Mac operating system and troubleshooting.
Apple licensed Technical Coordinator: Deeper knowing of the Mac OS, including the Mac OS X Server and Server essentials.
Apple certified techniques Administrator: Even more suitable technical understanding of the Mac OS X Server, including passing exams on Server necessities, listing features, Deployment, and Mobility and safety.
Apple licensed Media Administrator: here's a sister track of the “Apple licensed techniques Administrator” with a spotlight on the needs of media administration, and comprises working towards in XSan or final reduce.
Apple certified Macintosh Technician: that you could achieve Apple hardware repairs, both in and out of guarantee. Required to birth (or obtain a job with) an Apple licensed carrier provider, or self-provider your huge organization.
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Mozilla today announced that it will cease Firefox uphold for OS X 10.6 Snow Leopard, OS X 10.7 Lion, and OS X 10.8 Mountain Lion in August 2016. Unlike Google, which too dropped Windows XP and Vista support, Mozilla seems to breathe sticking to only removing uphold for aged Macs.
This means Mozilla will provide regular Firefox updates and security patches for Mac users on these operating systems for four more months. After that, the browser will still work, but it will breathe stuck on the ultimate version released in August.
Mozilla too offers a Firefox version called Extended uphold Release (ESR) for schools, universities, businesses, and others who need back with mass deployments. Firefox ESR releases are maintained for one year, and so Mozilla will continue to uphold it on OS X 10.6, 10.7, and 10.8 “until mid-2017.” Firefox ESR 45 will breathe the ultimate version that supports these aged OS X versions.
Mozilla correctly notes that “all three of these versions are no longer supported by Apple” and that “unsupported operating systems receive no security updates, beget known exploits, and are hazardous for you to use.” If you want to continue getting Firefox updates, the company thus recommends upgrading your Mac.
It’s unfortunate that Mozilla is not doing the identical with aged Windows versions. hold in mind that Microsoft retired Mainstream uphold for Windows XP on April 14, 2009 and then pulled Extended uphold for the operating system on April 8, 2014. Mozilla is thus going out of its pass to uphold XP for additional years, even longer than Microsoft.
Windows XP users cannot upgrade to newer versions of Microsoft’s browser: IE8 is the latest version they can install. IE9 is only available for Windows Vista and Windows 7, while IE10 and IE11 are only for Windows 7 and Windows 8. Many XP users thus pick to utilize third-party browsers.
With Chrome no longer an option, many are likely going with Firefox.
Last month, XP still had about 11 percent market share, according to Net Applications. Vista had 1.41 percent market share, and the three aged OS X versions had a combined 0.83 percent.
So if you’re wondering why exactly Mozilla keeps supporting Firefox on Windows XP and Vista, the numbers uncover the true story. There are hundreds of millions using the browser on the ancient operating systems, and Mozilla would rather beget those users than lose them.
But enjoy Google before it, Mozilla is not helping these users by not encouraging them to upgrade. Even with an up-to-date browser, using Windows XP and Vista is simply a poor security choice.
The information panel (below) presents every supported language, the version, its installed location, a description of the font, its copyright and trademark data, the number of glyphs supplied, whether it is embeddable, enabled, copy protected or installed as a duplicate.
Duplicate font files are flagged with a warning icon, and can breathe fixed automatically or resolved manually from a comparison drop down sheet (below).
The new Apple Color Emoji font supplies 502 glyphs in a TrueType font. Apple previously added emoticon uphold in iOS within Japanese input, which replaced typed characters with suggested faces created from Roman characters. The new skedaddle in Lion suggests company is likely to add actual Emoji input to the iOS as well.
Mac OS X 10.7 was first shown to the public in October 2010. The presentation was understated, especially compared to the bold rhetoric that accompanied the launches of the iPhone ("Apple reinvents the phone") and the iPad ("a magical and revolutionary device at an unbelievable price"). Instead, Steve Jobs simply called the new operating system "a sneak peek at where we're going with Mac OS X."
Behind Jobs, the screen listed the seven previous major releases of Mac OS X: Cheetah, Puma, Jaguar, Panther, Tiger, Leopard, and Snow Leopard. Such brief retrospectives are de rigueur at major Mac OS X announcements, but long-time Apple watchers might beget felt a slight tingle this time. The public "big cat" branding for Mac OS X only began with Jaguar; code names for the two earlier versions were not well known outside the developer community and were certainly not Part of Apple's official marketing message for those releases. Why bring the cat theme back to the forefront now?Want an eBook or PDF copy? uphold Ars and it's yours.
The retort came on the next slide. The next major release of Mac OS X would breathe called Lion. Jobs didn't Make a Great deal out of it; Lion's just another Great cat name, right? Within seconds, they were on to the next slide, where Jobs was pitching the new release's message: not "king of the jungle" or "the biggest Great cat," but the "back to the Mac" theme underlying the entire event. Mac OS X had spawned iOS, and now Apple was bringing innovations from its mobile operating system back to Mac OS X.
Apple had top-notch judgement to demure away from presenting Lion as the pinnacle that its denomination implies. The ultimate two major releases of Mac OS X were both profoundly shaped by the meteoric mount of their younger sibling, iOS.Steve Jobs presents the first seven releases of Mac OS X in a slightly unusual format
Leopard arrived later than expected, and in the identical year that the iPhone was introduced. Its successor, Snow Leopard, famously arrived with Your browser does not uphold the audio element. Click here to listenno new features , concentrating instead on internal enhancements and bug fixes. Despite credible official explanations, it was arduous to tremble the emotion that Apple's burgeoning mobile platform was stealing resources—not to mention the spotlight—from the Mac.
In this context, the denomination Lion starts to assume on darker connotations. At the very least, it seems enjoy the cease of the Great cat branding—after all, where can you ebb after Lion? Is this process of taking the best from iOS and bringing it back to the Mac platform just the first facet of a complete assimilation? Is Lion the cease of the line for Mac OS X itself?
Let's keep aside the pessimistic prognostication for now and reckon Lion as a product, not a portent. Apple pegs Lion at 250+ new features, which doesn't quite match the 300 touted for Leopard, but I guess it whole depends on what you reckon a "feature" (and what that "+" is hypothetical to mean). Still, this is the most significant release of Mac OS X in many years—perhaps the most significant release ever. Though the number of new APIs introduced in Lion may plunge short of the landmark Tiger and Leopard releases, the most notable changes in Lion are radical accelerations of past trends. Apple appears tired of dragging people kicking and screaming into the future; with Lion, it has simply decided to leave without us.Table of Contents
A brief note on branding: on Apple's website and in some—but not all—marketing materials, Apple refers to its new Mac operating system as "OS X Lion." This may well eddy out to breathe the denomination going forward, but given the current condition of confusion and my own stubborn nostalgia, I'm going to summon it "Mac OS X" throughout this review. Indulge me.Installation
Lion's system requirements don't disagree much from Snow Leopard's. You still need an Intel-based Mac, though this time it must too breathe 64-bit. The ultimate 32-bit Intel Mac was discontinued in August of 2007; Apple chose a similar four-year cut-off for dropping PowerPC support, with minimal customer backlash. Time marches on.
But sometimes time marches on a bit too fast. Though this is the second version of Mac OS X that doesn't uphold PowerPC processors, this is the first version that won't Hurry PowerPC applications. In Snow Leopard, the Rosetta translation engine allowed PowerPC applications to run, and Hurry well, often faster than they ran on the (admittedly older) PowerPC Macs for which they were developed. Lion no longer includes Rosetta, even as an optional install.
No one expects eternal uphold for PowerPC software, and any developer that doesn't yet beget Intel-native versions of whole its applications is clearly not particularly dedicated to the Mac platform. Nevertheless, people still depend on some PowerPC applications. For example, I beget an aged PowerPC version of Photoshop. Though Photoshop has long since gone Intel-native, it's an expensive upgrade for someone enjoy me who uses the program only rarely. The PowerPC version suits my needs just fine, but it won't Hurry at whole in Lion.
Another common example is Quicken 2007, still the most capable Mac version of Intuit's finance software, and still PowerPC-only. This is clearly Intuit's fault, not Apple's, but from a regular user's perspective, it's arduous to understand why Apple would remove an existing, completed feature that helped so many people.
In reality, every feature has some associated maintenance cost. This is perhaps even more true of a binary translation framework that may beget profound hooks into the operating system. I'm willing to give Apple the benefit of the doubt and assume that disentangling PowerPC-related code from the operating system once and for whole was notable enough to justify the customer inconvenience. But it still stings a little.
The future shock continues with the purchase and installation process. Lion is the first version of Mac OS X to breathe distributed through Apple's recently introduced Mac App Store. In fact, the Mac App Store is the only location where you can buy Lion.
Apple's decision ultimate year to sell its iLife and iWork applications through the Mac App Store was not unexpected, but the presence of Apple's professional photography application, Aperture, caught some people off guard—as did its greatly reduced price ($80 vs. $200 for the boxed version).
The developer preview releases of Lion were too distributed through the Mac App Store. Apple's developer releases beget been distributed digitally for many years now, but the switch from downloading disk images from Apple's developer website to "redeeming" promo codes and downloading new builds from the Mac App Store raised some eyebrows. When Apple announced that its new Final gash Pro X professional video editing application would—you guessed it—be distributed through the Mac App Store, and at a greatly reduced price, even the most dense Apple watchers started to obtain the hint.The Lion installer application icon
And so they beget Lion, priced at a mere $29 (the identical as its "no new features" predecessor), available exclusively through the Mac App Store. It's an audacious move, yes, but not unexpected.
Apple is so done with stamping bits onto plastic discs, putting the discs into cardboard boxes, putting those boxes onto trucks, planes, and boats, and shipping them whole over the world to retail stores or to mail-order resellers who will eventually keep those identical boxes onto a different set of trucks, trains, and planes for final delivery to customers, who will then remove the disc, fling away the cardboard, and instruct their computers to extract the bits. No, from here on out, it's digital distribution whole the way. (This, I suppose, marks the cease of my longstanding tradition of showing the product boxes or optical discs that Mac OS X ships on. Instead, you can perceive the installer application icon on the right.)
Lion is a great download and expeditiously network connections are still not ubiquitous. But new Macs will reach with Lion, so the most relevant question is, how many people who method to upgrade an existing Mac to Lion don't beget a expeditiously network connection? The class of people who effect OS upgrades probably has a higher penetration of high-speed Internet access than the general population. I too suspect that Apple retail stores may breathe willing to back out customers who just can't manage to download a 3.76GB installer in a reasonable amount of time.
[Update: Macworld reports that there will, in fact, breathe a physical manifestation of Lion. Starting in August, Apple will sell Lion on a USB stick for $69. Apple has too said that customers are welcome to bring their Macs to Apple retail stores for back buying and installing Lion.]
In the meantime, if you're reading this, chances are top-notch that you beget a expeditiously broadband connection; feel free to cease reading right now, launch the Mac App Store, and start your multi-gigabyte download before continuing. What you'll breathe rewarded with at the cease is an icon in your Applications folder labeled "Install Mac OS X Lion." (See?)
Once you beget the installer application, you could (were you so inclined) dig into it (control-click, then expose Package Contents) and find the meaty center, a 3.74GB disk image (InstallESD.dmg, stored in the Contents/SharedSupport folder). You could then utilize that disk image to, say, parch a Lion installation DVD or create an emergency external boot disk.
I doubt any of these things are officially supported by Apple, but the point is that there's nothing exotic about the Lion installer. enjoy whole past versions of Mac OS X, Lion has no serial number, no product activation, and no DRM of any kind. In fact, the Mac App Store's licensing policy is even more permissive than past releases of Mac OS X. Here's an excerpt from Lion's license agreement:
If you obtained a license for the Apple Software from the Mac App Store, then topic to the terms and conditions of this License and as permitted by the Mac App Store Usage Rules set forth in the App Store Terms and Conditions (http://www.apple.com/legal/itunes/ww/) ("Usage Rules"), you are granted a limited, non-transferable, non-exclusive license:
(i) to download, install, utilize and Hurry for personal, non-commercial use, one (1) copy of the Apple Software directly on each Apple-branded computer running Mac OS X Snow Leopard or Mac OS X Snow Leopard Server ("Mac Computer") that you own or control;
The references to Snow Leopard are a bit confusing, but hold in mind that you need Snow Leopard to purchase and download Lion for the first time. I suspect the license agreement will breathe updated once Lion has been out for a while.
There's too another spellbinding clause in the license, from that identical section:
(iii) to install, utilize and Hurry up to two (2) additional copies or instances of the Apple Software within virtual operating system environments on each Mac Computer you own or control that is already running the Apple Software.
Putting it whole together, Apple says you're allowed to Hurry up to three copies of Lion—one real, two inside virtual machines—on every Mac that you own, whole for the low, low price of $29. Not a cross deal.
The installer itself is extinct simple, foreshadowing the pervasive simplification in Apple's new OS. There are no optional installs and no customization. The only response the user provides is agreeing to the obligatory EULA, and the only configurable install parameter is the target disk.Enlarge
But wait a second—how exactly is this going to work? Surely an entirely new operating system can't breathe installed on top of the currently running operating system by an application stored on the identical volume. Without a plastic disc to boot from, how is it even practicable to upgrade a standalone Mac with just one arduous drive?
These questions probably won't occur to an tolerable consumer, which is sort of the point, I guess. positive enough, if you just nigh your eyes, launch the installer application, and click your pass through the handful of screens it presents, your Mac will reboot into what looks enjoy the measure Mac OS X installer application from years past. When it's done, your Mac will reboot into Lion. Magic!
Okay, it's not magic, but it is a bit complicated. The first and most lasting amaze is that the Lion installer will actually repartition the disk, carving out a 650MB slice of the disk for its own use.
Don't worry, whole existing data on the disk will breathe preserved. (Mac OS X has had the faculty to add partitions to existing disks without destroying any data for many years now.) whole that's required is enough free space to reshuffle the data as needed to Make margin for the new partition.
Here's an example from my testing. I started with a lone 250GB arduous drive split into two equal partitions: the first named "Lion Ex," currently running Snow Leopard, and the intended target of the Lion install, and the second named "Timex," the Time Machine backup volume for Lion Ex. The output from the diskutil list command appears below./dev/disk1 #: nature denomination SIZE IDENTIFIER 0: GUID_partition_scheme *250.1 GB disk1 1: EFI 209.7 MB disk1s1 2: Apple_HFS Lion Ex 125.0 GB disk1s2 3: Apple_HFS Timex 124.6 GB disk1s3
Now here's that identical disk after installing Lion, with the new partition highlighted:/dev/disk1 #: nature denomination SIZE IDENTIFIER 0: GUID_partition_scheme *250.1 GB disk1 1: EFI 209.7 MB disk1s1 2: Apple_HFS Lion Ex 124.5 GB disk1s2 3: Apple_Boot Recovery HD 654.6 MB disk1s3 4: Apple_HFS Timex 124.6 GB disk1s4
The new partition is actually considered a different type: Apple_Boot. The Recovery HD volume won't breathe automatically mounted upon boot and therefore won't loom in the Finder. It's not even visible in the Disk Utility application, appearing only as a tiny blank space in the partition map for the disk. But as shown above, the command-line diskutil program can perceive it. Diskutil can mount it too.
Doing so reveals the partition as a classic HFS+ volume. The top flush contains a directory named com.apple.recovery.boot which in eddy contains a few minuscule files related to booting along with an invisible 430MB internally compressed disk image file named BaseSystem.dmg. Mount that disk image and you find a 1.52GB bootable Mac OS X volume containing Safari, most of the contents of the measure /Applications/Utilities folder (Disk Utility, Startup Disk, Terminal, etc.), plus a Mac OS X Lion installer application. In other words, it looks a lot enjoy a measure Mac OS X installer DVD.
A subset of the files copied to the recovery partition is too copied to the installation target disk by the installer and blessed as the new bootable system. This is what the Lion installer reboots into. The files to install will breathe read from the Lion installer application downloaded earlier from the Mac App Store. After the installation is complete, the temporary boot files are removed, but the Recovery HD partition remains on the disk. Hold down ⌘R during system startup to automatically boot into the Recovery HD partition. (Holding down the option key during startup—not a new feature in Lion—will too expose the Recovery HD partition as one of the boot volume choices.)
Booting from the recovery partition really means mounting and then booting from the BaseSystem.dmg disk image on the recovery partition. Doing so presents a list of the traditional Mac OS X install disc options, including restoring from a Time Machine backup, reinstalling Mac OS X, running Disk Utility, resetting your password, and so on. There's too an option to obtain back online, which will launch Safari. Including Safari on the recovery partition is a nice touch, since most people's first cease when diagnosing a problem is Google, not the Genius Bar.
The upshot is that after whole the file compression magic added in Snow Leopard to reduce the footprint of the OS, Lion steals over half a gigabyte of your disk space as Part of its installation process, and never gives it back. The partition's denomination makes Apple's intent clear: it's meant as a last-ditch mechanism to diagnose and repair a Mac with a hosed boot volume. (Hosed, that is, in the software sense; existing as it does on the boot disk itself, the recovery partition won't breathe much utilize if the disk has hardware problems.)
Apparently Apple has decided that the faculty to boot a Mac into a known-good (software) condition is well worth sacrificing a minuscule amount of disk space. MacBook Air owners or other Mac users with diminutive solid-state disk drives may disagree, however. In that case, the disk space can breathe reclaimed by some judicious repartitioning with Disk Utility (or the diskutil command-line tool) while booted from another disk. But don't breathe surprised when the fellow at the Genius Bar frowns a tiny at your deviation from the Apple Way.Reconsidering fundamentals
The user-visible changes in Lion are legion. You'll breathe hard-pressed to find any Part of the user interface that remains completely unchanged from Snow Leopard, from the study and feel whole the pass down to basic behaviors enjoy application and document management. In Lion, Apple has taken a arduous study at the assumptions underlying the ultimate ten years of Mac OS X's development—and has decided that a lot of them need to change. obtain ready.Lion's new look
Let's ease into things with a tour of Lion's revised user interface graphics. Though Apple still uses the denomination "Aqua" to advert to Lion's interface, the study is a far wail from the lickable, candy-coated appearance that launched the brand. If you can imagine three dials labeled "color," "contrast," and "contour," Apple has been turning them down slowly for years. Lion accelerates that process.
The shapes beget started to change, too. The traditional capsule shape of the measure button has given pass to a squared-off, Chiclets-style appearance. The tubular shape of the progress bars, a fixture since even before the dawn of Mac OS X, has been replaced with a vaguely puffy stripe of material. Radio buttons, checkboxes, slider thumbs, segmented controls, "tab" controls—nearly everything that used to protrude from the screen now looks as if it was pounded down with a rubber hammer.Finder sidebar: gray
Even the elements that study identical, enjoy the unpretentious gray window title bars, are slightly different from their Snow Leopard counterparts. The new study is not a radical departure—everything hasn't gone jet black and grown fur, for example—but this is the first time that nearly every ingredient of the measure GUI has been changed in a pass that's identifiable without a color meter or a magnifying glass.
For the most part, the new study speaks in a softer voice than its predecessor. The total removal of blue highlights from several controls (e.g., pop-up menus, combo boxes, slider thumbs, and tab controls) makes most interfaces loom slightly less garish. On the other hand, the additional green in the blue highlights that still achieve exist makes those controls loom more saccharine.
Apple says that its goal with the Lion user interface was to highlight content by de-emphasizing the surrounding user interface elements. You can perceive this most clearly in sidebar and toolbar icons, which are now monochromatic in most of the notable bundled applications. But this has the unfortunate side sequel of making interface elements less distinguishable from each other, especially at the minuscule sizes typical in sidebars. I'm not positive the "increased accent on content" is enough to equipoise out the loss, especially in applications enjoy the Finder.Lion Snow Leopard
Appearance changes can beget effects beyond emphasis, fashion, and mood. assume the "traffic light" red, yellow, and green window widgets, for example. As you can perceive in the images on the right, they've gotten smaller in Lion. Or rather, the colored portion has gotten smaller; the actual clickable zone has lost only one pixel in height and five pixels in total width across whole three widgets.
But the psychological sequel of the shrunken appearance is something else entirely. Despite the tiny difference in the functional size, I find myself being ever-so-slightly more mindful when targeting these widgets in Lion. It's a tiny annoying, especially since it's not lucid to me how the new, smaller size fits into Lion's new look. Does such a minuscule reduction in size really serve to better emphasize window content? After all, no one of the other controls beget gotten any smaller.
Other aspects of the new study beget clearer intentions. The flatter, more matte study of most controls, and especially the squared-off shape of the measure button, whole bring to mind the study of Apple's other operating system, iOS. One control in particular takes the iOS connection even further.
Finally, there's Apple's budding fancy lookout with a particular linen texture. It made its first appearance on the backside of some Dashboard widgets. More recently, it was used as the background pattern for the notifications sheet in iOS 5. In Lion, it's featured even more prominently as the background for the newly restyled login screen, now featuring circular frames for user icons. (Also note the subset of menu bar status icons still visible in the top-right corner of the screen.)Enlarge / Linen for your login screen Scroll bars
Scroll bars, which Apple likes to summon "scrollers" these days, are among the least-changed interface elements in Mac OS X. While the repose of the Aqua interface was refined—edges sharpened, pinstripes removed, shines flattened—scrollbars stubbornly retained their original Aqua study for over a decade.A scroll bar from Mac OS X DP3, released in 2000 A scroll bar from Mac OS X 10.6, released in 2009
Scroll bars haven't been entirely static in Mac OS X, however. For many years, iTunes has had its own custom scroll bar look.A scroll bar from iTunes 10.2.2, released in 2011
When these new scroll bars were first introduced in iTunes 7 in 2006, there was some speculation that this was a ordeal Hurry for a new study that would soon spread throughout the OS. That didn't happen. But now, five years later, scroll bars are finally changing system-wide in Mac OS X. Here's a scroll bar from Lion:A scroll bar from Mac OS X 10.7 Lion
The smeared gradient and fuzzy edges of the iTunes scroll thumb are nowhere to breathe seen. Instead, they beget a narrow, monochrome, sharp-edged lozenge. Just enjoy the window widgets, the scroll thumb appears slightly smaller than its Snow Leopard counterpart. (In this case, total scroll bar width and the clickable zone are actually the identical as in Snow Leopard.)
The change in appearance might distract you from what's really different: where are the scroll arrows? You know, the tiny buttons on either cease of the scroll bar (or grouped together on one end) that you click to skedaddle the scroll thumb a bit at a time? Well, they're gone.
But wait, there's more. Here's a Finder window.The complete contents of Lion's Applications folder…or is it?
Though I can assure you that Lion comes with more than eight applications, you wouldn't know it from looking at this screenshot. Forget about the arrows, where are the scroll bars?
Placing the cursor into the window and using the scroll wheel on the mouse or two-finger scrolling on a trackpad reveals what you might beget already guessed based on the shape and appearance of the new scroll thumbs. Extremely thin, monochrome scroll thumbs fade in as the scrolling begins, and evaporate shortly after it ends. These evanescent scroll thumbs loom on top of the window's content, not in alleys reserved for them on the edges of the window.Initiating scrolling (via mouse wheel or trackpad) reveals overlay scroll bars. More applications below! An iOS scroll bar
These ghostly overlay scroll bars are straight out of iOS. When they were introduced in 2007 on the iPhone's 3.5-inch screen, they made consummate sense. Dedicating one or more finger-width strips of the screen for always-visible, touch-draggable scroll bars would beget been a colossal waste of pixels (and anything less than a finger's width of pixels would beget been too narrow to comfortably use). Overlay scroll bars were essential in iOS, and completely in keeping with its direct manipulation theme. In iOS, you don't manipulate an on-screen control to scroll, you simply grab the whole screen with your finger and skedaddle it.
Apple isn't (yet) asking us to start poking their fingers at their Mac's screen, but it does now ship every Mac with some benevolent of touch-based input device: internal trackpads on laptops, and external trackpads or touch-sensitive mice on desktops. Lion further cements the dominance of finger by making whole touch-based scrolling work enjoy it does on a touchscreen. Touching your finger to a control surface and moving it downwards will skedaddle the document downwards, revealing more content at top and hiding some of the content that was previously visible on the bottom. This sounds perfectly logical, but it too happens to breathe exactly the antithetical how scrolling has traditionally worked with mouse scroll wheels. The sequel is extremely disconcerting, as their fingers unconsciously flick at the scroll-wheel while their eyes perceive the document moving the "wrong" way.Scroll direction setting in the Mouse preference pane. Checked means the new Lion scrolling direction is in effect.
Thankfully, there is a preference to restore the aged mapping of finger movement to scroll direction. There's a second setting in the Trackpad preference pane, phrased in the antithetical way. Unfortunately, the settings are linked; you can't beget different values for each benevolent of input device.
Though the unification of scrolling gestures is logical, it's difficult to obtain used to after so many years of doing things the other way. The most common scrolling direction is downwards, and the most natural finger movement is curling inwards. These two things align when using a mouse wheel with the "old" scrolling direction setting. aged habits aside, it may breathe that the difference between touching a screen directly and touching a part device on a horizontal surface in front of the screen is just too Great to justify a lone input vocabulary.
Either way, there's positive to breathe an uncomfortable transition period for everyone. For example, the two-finger swipe to the left or right used to switch between screens in Launchpad (described later) feels "backwards" when the scroll direction preference is set to the traditional, pre-Lion behavior. Perhaps just seeing a screen covered with a grid of icons unconsciously triggers the "iOS expectations" region of their brains. (And if you set the scroll direction to "feel right" for two-finger swiping in Launchpad, then the four-finger swipe between Spaces feels backwards! Sigh.)
Scroll bars achieve more than just let us scroll. First, their condition tells us whether there's anything more to see. A window with "inactive" (usually shown as dimmed) scroll bars indicates that there is no content beyond what is currently visible in the window. Second, when a document has more content than can apt in a window, the scroll bars uncover us their current position within that document. Finally, the size of the scroll thumb itself—or the amount of margin the scroll thumb has to skedaddle within the scroll bar, if you want to study at it that way—gives some hint about the total size of the content.Classic Mac scroll bars
Most computer users aren't conscious of such subtleties, but their combined effects are profound. Long-time Mac users might remember a time when scroll thumbs were perfectly square regardless of the total size of a window's content. When I reckon back to my time using those scroll bars, I don't recall any problems. But just try using these so-called "non-proportional" scroll bars today. The modern computer user's mind revolts at the want of information, usually treating it instead as misleading information about the total size of a window's content. ("This window looked enjoy it had pages and pages of content, but when I dragged the tiny square scroll thumb whole the pass from the top to the bottom, it only revealed two new lines of text!") Only when this cue is gone achieve you realize how much you've been relying on it.
And hold in mind that proportional scroll thumbs are the most subtle of the cues that scroll bars provide. The others are even more widely relied upon. The complete want of visible scroll bars leaves a huge information void.
Let's keep aside the chummy for a moment. In the absence of scroll bars, are there other visual cues that could provide the identical information? Well, if truncated content appears at the edge of a window, it's usually a safe wager that there's more content in that direction. The prevalence of whitespace (between icons in the Finder, between lines of text, etc.) can Make such truncation less obvious or even undetectable, but at least it's something. For total content size and position within the document, there's no alternative even that good.
But presentiment not, gentle scroller. enjoy the scroll direction, scroll bar visibility has a dedicated preference (in the general preference pane):Scroll bar settings in the general preference pane
The default setting, "Automatically based on input type," will utilize overlay scroll bars as long as there's at least one touch-capable input device attached (though the trackpad on laptops doesn't signify if any other external pointing devices are connected). If you don't enjoy this benevolent of second-guessing, just pick one of the other options. The "When scrolling" option means always utilize overlay scroll bars, and the "Always" option means always expose scroll bars, using the appearance shown earlier.
Lion includes new APIs for briefly "flashing" the overlay scroll bars (i.e., showing them, then fading them out). Most applications included with Lion briefly expose the scroll bars for windows that beget just appeared on the screen, beget just been resized, or beget just scrolled to a new position (e.g., when showing the next match while searching within a document). This helps soften the blow of the missing information previously provided by always-visible scroll bars, but only a little.Extra UI in the scroll bar area
Applications with other UI elements whose rectify placement relies on the being of a reserved 16-pixel stripe for the scroll bar outside the content zone of the window may breathe forced to display what Apple calls "legacy" scroll bars. (Apple's term for non-overlay scroll bars tells you whole you need to know about which pass the wind is blowing on this issue.) You can perceive an example of one such UI ingredient in the image on the right. The document scale pop-up menu (currently showing "100%") pushes the horizontal scroll bar to the left to Make margin for itself. Clearly, this will not work if the scroll bar overlays the content zone and is hidden most of the time. Apple suggests that such applications find new homes for these interface elements, at which point the AppKit framework in Lion will allow them to display overlay scroll bars.
Lion's scroll bars are a microcosm of Apple's new philosophy for Mac OS X. This is definitely a case of reconsidering a fundamental Part of the operating system—one that hasn't changed this radically in decades, if ever. It's too nearly a straight port from iOS, which is in keeping with Apple's professed "back to the Mac" mission. But most importantly, it's a concrete example of Apple's newfound dedication to simplicity.
In particular, this change reveals the tremendous weight that Apple gives to visual simplicity. A complete want of visible scroll bars certainly does Make the tolerable Mac OS X screen study a lot less busy. A want of visual clutter has been a hallmark of Apple's hardware and software design for years, and iOS has only accelerated this theme. Also, practically speaking, the sum of whole those 16-pixel-wide stripes reserved for scroll bars on window edges may add up to a nontrivial extend in the number of pixels available for displaying content on a Mac's screen.
But there is a price to breathe paid for this simplicity; one person's pandemonium is another person's essential source of information. Visual information, enjoy the size and position of a scroll thumb, is one of the most efficient ways to communicate with humans. (Compare with, say, numeric readouts showing document dimensions and the current position as a percentage.)
These sacrifices were an essential Part of the iPhone's success. The iPad, though larger, is clearly Part of the identical touch-based family of products, and is wisely built on the identical foundation. But the Mac is a different kettle of fish—and not just because the screen sizes involved may breathe vastly larger, making the space savings of hidden scroll bars much less important.
The Mac user interface, with its menus, radio buttons, checkboxes, windows, title bars, and yes, scroll bars, is built on an entirely different interactivity model than iOS. The Mac UI was built for a pixel-accurate roundabout pointing device; iOS was built for direct manipulation with one or more fingers. The visual similarity of on-screen elements and the technical feasibility of porting them from one OS to the other should not blind us to these essential differences.
It's spellbinding that whole of the scrolling changes in Lion beget preferences that allow them to breathe reverted to their pre-Lion behaviors. The defaults clearly testify the direction that Apple wants to go, but the settings to invert them—public, with true GUIs, rather than undocumented plist hacks—suggest caution, or perhaps even some internal strife surrounding these features.
Such caution is well-founded. Hidden scroll bars in particular beget trade-offs that change dramatically based on the size of the screen and the input device being used. enjoy many features in Lion, the scrolling changes are most useful and appropriate on the Macs that are closest to iOS devices in terms of size and input method (the 11-inch MacBook Air being the best example). But on a Mac Pro with dual 27" 2560x1440-pixel displays attached, Lion's scrolling defaults Make far less sense.Window resizing Resize widget
A want of traditional scroll bars too means the elimination of the minuscule patch of pixels in the lower-right corner of a window where the upright and horizontal scroll bars meet. Since 1984, this zone has been home to the one and only control used to resize a window. Setting the scroll bar appearance preference to "always visible" restores the clickable true estate, albeit sans the traditional "grip lines."
Despite the unpretentious appearance, this resize control works as expected; what's unexpected is the cursor change that accompanies the action. The double-arrow cursor has been used in other operating systems for years, mostly to differentiate two-axis resizing (width and height) from single-axis resizing (height only or width only). When there's only one resize control per window, it's obvious that it can breathe used to change both the width and the height. Lion's new cursor can breathe of value only one thing…Window resizing from whole edges (composite image)
That's right, long-suffering switchers, Lion finally allows windows to breathe resized from any edge and from whole four corners, with a special cursor for each of the eight starting points. (When a window is at its size limit, the cursors expose an arrow pointing in a lone direction—a nice touch.)
As you can perceive from the image above, what Apple hasn't done is add borders to the windows. So where, exactly, achieve they "grab" when resizing from a borderless window edge? There's no pass around it: some pixels must breathe sacrificed to the gods of Fitts's law.
A few pixels within the outer edge of the content zone of the window (two to three, depending on where you signify from) are commandeered for window resizing purposes. You can still click on these areas, and the click event will correctly propagate to the application that owns the window, but you'll breathe clicking with a resize cursor instead of a classic arrow cursor.
Two to three pixels doesn't Make for a very wide target, however, which is why Apple has chosen to appropriate pixels from both sides of the window border. Four to five pixels outside the content zone of the window are too clickable for window resizing purposes. Clicks in these areas don't obtain sent to the window (they're out of the window's bounds) and they don't obtain sent to whatever happens to breathe behind the energetic window—you know, the thing that you ostensibly just clicked on. Effectively, Lion windows beget thin, invisible borders around them used only for resizing. (Unlike Mac OS 8 and 9 windows, which had real, visible borders, Lion windows can't breathe dragged by their borders.)
When overlay scroll bars are in use, the complete 16x16 pixel home of the traditional resize widget in the lower-right corner is clickable, making this still the easiest target for window resizing, whether it's visible or not.Unzoom widget Zoom widget
Lion has a few more surprises on window edges, one of which is window size-related. Windows belonging to applications that uphold Lion's new full-screen mode may expose an embossed double arrow icon on the far-right side of their title bars. Clicking it will judgement the window to fill the entire screen. Other windows, the Dock, and even the menu bar are hidden in this mode. The window's title bar too disappears, making it unclear how to exit this mode. But just stab the cursor at the top of the screen and the menu bar slides back down into view, containing whole the expected menus plus a reversed version of the double arrow symbol. Click the inward-facing arrows to assume the current window out of full-screen mode.Animation
Mac OS X has always used animation in its user interface, starting with the genie sequel over a decade ago, and really ramping up with the introduction of the Core Animation framework three years ago. Lion continues this trend. In nearly whole new or changed applications in Lion, if something conceivable can breathe animated, it is. The Finder is a top-notch example. Even features whose functionality hasn't actually changed in Lion, such as dragging multiple items from one window to another, are given a fresh coating of animation and fades.
At its best, animation explicitly communicates information that was either absent or only implied before. For example, the genie animation tells the user where a window goes when it's minimized. In other cases, such as the water ripple sequel in Dashboard, animation can add a bit of fun to an interface.
But danger lurks. A newly discovered animation might delight the user the first time it's shown, but the 350th time might not seem quite so magical. This is especially true if the animation adds a delay to the task, and if that assignment is done frequently as Part of a time-sensitive overall task. The Dashboard water ripple is acceptable because adding a new widget to the screen is an infrequent task. But if the screen rippled every lone time a new window appeared anywhere in the OS, users would revolt.
Well, guess what happens every time a new window appears on the screen in Lion? No, it's nothing as garish as a water ripple, but there is an animation. Each window starts as a tiny dot centered on the window's eventual position on the screen, then quickly animates to its complete size.
This animation conveys no new information. It does not uncover the user where a window came from, since the animation starts at the final position of the window. Whether or not the animation actually delays the opening of the window, it certainly feels enjoy it does, which is even more important. This nature of animation can Make Lion feel slower than Snow Leopard. And when an animation enjoy this stutters or skips a few frames due to ponderous disk i/o or CPU usage, it makes your whole Mac feel slower, enjoy you're playing a 3D game with an inadequate video card. And for what? For what someone at Apple hopes will breathe a lasting emotion of delight?
Perhaps it could breathe argued that the animation catches the eye more than a window that appears instantly (though that probably depends on the size of the window and what's behind it on the screen). For "unexpected" windows enjoy oversight dialog boxes, that could breathe a benefit. But for "expected" windows (i.e., those that loom in response to deliberate user input), the powerful, primordial draw of these moving images is an unwelcome distraction, not a benefit.
It's conceivable that this animation could delight some users, but I beget a arduous time believing that the enjoyment will ultimate much past the first week. (Interestingly, this animation does not play in invert when a window is closed. This, perversely, makes window closing feel faster than window opening in Lion.)
Unlike the scrolling behaviors discussed earlier, there are no user-visible preferences for these new animations, which makes it whole the more notable for Apple to strike a top-notch balance. In my estimation, Lion crosses the line in a few places; the new window animation is the most egregious example. I study forward to discovering a pass to disable it. [Update: here it is: defaults write NSGlobalDomain NSAutomaticWindowAnimationsEnabled -bool NO]Here's to the crazy ones
Bruce Tognazzini, founder of the Apple Human Interface Group and 14-year Apple veteran (1978-1992), is best known as the man behind the publication of the Apple Human Interface Guidelines. In 1992, he published a bespeak of his own: Tog on Interface. Most of the examples in the bespeak were taken from his work at Apple. Here's an excerpt from pages 156-157:
Natural objects beget different perceivable characteristics, among which people can easily discriminate. assume the bristlecone pine. The oldest animate thing on earth, it has been formed and shaped by the wind and scarred by thousands of years of existence. The youngest school kids study at it and know there must breathe a lot of wind around there. They know the pine may breathe even older than their father. They too know, to a certainty, that it is a tree.Hypercard "Home" icons
Kristee Kreitman Rosendahl, amenable for not only the realistic design of HyperCard, but too much of its spirit, created a collection of Home icons that shipped with the product.
No one has ever shown confusion at seeing various tiny houses on various cards. Never once has someone turned around and said, "Gee, this tiny house has three windows and seems to breathe a Cape Cod. Will that assume me to a different Home card than that two-story bunk house back in the other section?" People are designed to ply multiplexed meanings gracefully, without conscious thought.
In System 7, they multiplexed the import of system extensions, by developing a characteristic "generic" extension look, to which developers can add their own unique study for their specific product. As the "bandwidth" of the interface increases, these kinds of multiplexings will become more and more practical.System 7 extension icons
This is Tog, godfather of the old-school Apple Human Interface Guidelines, stating emphatically that interface elements achieve not beget to study exactly the identical in order for their office to breathe discerned. In fact, in the final sentence, Tog predicts that increased computing power will lead to more diverse representations. The increased "bandwidth" of user interfaces that Tog wrote about almost 20 years ago has now reach to pass, and then some.
Examples of "multiplexed meanings" in Mac OS X are not arduous to find. study at the Dock, which has changed appearance several times during the history of Mac OS X while still remaining immediately identifiable. And, as discussed earlier, nearly every measure GUI control has changed its appearance in Lion. As Tog notes, people are excellent at discarding unimportant details and focusing on the most salient aspects of an item's appearance.
Now, keeping whole this in mind, I invite you to ogle upon this screenshot of the version of iCal that ships with Lion.
Enlarge / A stitch in time saves…something, presumably
When this change was first revealed in the second developer preview of Lion, there was much gnashing of teeth. But question yourself, is the office of every control in the toolbar clear? Or rather, is it any less lucid than it would breathe if iCal used the measure Mac OS X toolbar appearance?
The immediate, visceral negative reaction to the wealthy Corinthian leather appearance had tiny to achieve with usability. What it came down to—what first impressions enjoy these always seem to reach down to—is whether or not you reckon it's ugly. People will assume "really cool-looking but slightly harder to use" over "usable but ugly" any day.
But there's something much more notable than the change in appearance going on here. Lion's iCal doesn't study different in an whimsical way; it's been changed with purpose. After the initial stitched-leather shock wore off, Apple watchers everywhere leapt on the new iCal's deeper sin: its skeuomorphic design. From Wikipedia (emphasis added):
A skeuomorph is a derivative object that retains ornamental design cues to a structure that was necessary in the original. Skeuomorphs may breathe deliberately employed to Make the new study comfortably aged and familiar, such as copper cladding on zinc pennies or computer printed postage with circular town denomination and cancellation lines. An alternative definition is "an ingredient of design or structure that serves tiny or no purpose in the artifact fashioned from the new material but was essential to the object made from the original material."
Apple has been down this road before, most notably with the QuickTime 4.0 player application which included intelligent ideas enjoy a "dial" control for adjusting the volume. Dials work Great in the real, physical world, and are certainly chummy to most people. But a dial control in the context of a 2D mouse-driven GUI is incongruous and inept at best, and completely incomprehensible at worst.
The brushed metal appearance of the QuickTime player would later inspire an officially supported Mac OS X window appearance starting in version 10.2, only to breathe dropped completely five years later in 10.5's grandiose interface unification. Now, three years after that, the pendulum is swinging in the other direction again—and hard.
In the case of iCal, Apple has aped the appearance of an analogous physical object (a tear-off paper calendar) but retained the conduct of measure Mac OS X controls. This avoids the problems of the QuickTime 4.0 player's dial control, but it's far from a antiseptic win.
The misfortune is, the new iCal looks so much enjoy a chummy physical object that it's effortless to start expecting it to behave enjoy one as well. For example, iCal tries very arduous to sell the tear-off paper calendar illusion, with the stitched binding, the tiny remains of already-removed sheets, and even a page curl animation when advancing through the months. But can you grab the corner of a page with your mouse and tear it off? Nope, you beget to utilize the arrow buttons or a keyboard command, just enjoy in the previous version of iCal. Can you scribble in the margins? Can you cross off days with a pen? Can you riffle through the pages? No, no, and no.
At the identical time, iCal is still constrained by some of the limitations of its physical counterpart. A paper calendar must pick a lone pass to crash up the days in the year. Usually, each page contains a month, but there's no judgement for a virtual calendar to breathe limited in the identical way. When dealing with events that span months, it's much more convenient to view time as a continuous stream of weeks or days. This is especially true on great desktop monitors, where zooming the iCal window to complete screen doesn't expose any more days but just makes the days in the current month larger.
The new version of Address bespeak in Lion is an even more egregious example.Enlarge / These graphics are writing checks this interface can't cash
Address bespeak goes so far in the direction of imitating a physical analog that it starts to impair the identification of measure controls. The window widgets, for example, are so integrated into the design that they're effortless to overlook. And as in iCal, the astonishing detail of the appearance implies functionality that doesn't exist. Pages can't breathe turned by dragging, and even if they could, the number of pages on either side of the spine never changes. The window can't breathe closed enjoy a book, either. That red bookmark can't breathe pulled up or down or removed. (Clicking it actually turns the page backwards to expose the list of groups. Did you guess that?) The three-pane view (groups → people → detail) is gone, presumably because a bespeak can't expose three pages at once. Within each paper "page" sits, essentially, an excerpt from the user interface of the previous version of Address Book. It's a mixed metaphor that sends mixed signals.
These newly redesigned Mac OS X applications are clearly inspired by their iOS counterparts, which bear similar graphical flourishes and skeuomorphic design elements. (Address bespeak in particular is a extinct ringer for the Contacts app on the iPad.) In iOS, the inability to eddy pages with the flick of a finger or yank out that tantalizing red bookmark is even more frustrating. In both environments, when the behaviors seemingly promised by the graphical design aren't delivered, whole this artwork that was so clearly labored over fades into the background. The application trains us to ignore it. What was once, at best, a momentary amusement is reduced to visual noise.
In 2011, we're far past the point where computer interfaces need to reference their forebearers in the physical world in order to breathe understandable (though it's practicable Apple thinks the familiarity of such designs is still an efficient pass to reduce intimidation, especially for novice users). At the identical time, hardware and software beget advanced to the point where there's now ample "bandwidth" (to utilize Tog's term) to uphold visual and functional nuances beyond the bare necessities.
Interface designers are faced with the challenge of how best to utilize the glut of resources now at their disposal. As Lion's iCal and Address bespeak applications demonstrate, an alternate description of this situation might breathe "enough rope to hang yourself."Window management
Over the years, Apple has added several features that could loosely breathe defined as "window management aids." The first, and arguably most successful, was Exposé, introduced in Panther back in 2003. Two years later, Tiger shipped with Dashboard, which provided a dedicated screen for minuscule "widget" windows, keeping them off the main screen. In 2007, Leopard brought official uphold for virtual desktops to Mac OS X under the denomination Spaces.
Each of these features came with its own set of configurable keyboard shortcuts, irritated screen corners, and (eventually) multi-touch gestures. While each was understandable and useful in isolation, it was up to each user to device out how best to incorporate them into a workflow. In Lion, Apple has taken a stab at consolidation under the umbrella denomination of Mission Control. Each individual feature still exists, albeit in slightly more limited forms, but activating one thing now provides access to them all.
Using any one of the supported Mission Control activation methods—a keyboard shortcut, a irritated screen corner, or a four-finger upwards swipe—causes the current desktop picture to ebb slightly into the focus of the screen, revealing behind it their aged friend the linen pattern. Overlaid on this are groups of windows, badged by the icons of the applications to which they belong. Along the top of the screen sit whole open Spaces. (In Lion, each full-screen window creates a new Space, so those windows loom at the top rather than grouped with the other windows from the identical application.) Dashboard is too (optionally) given its own Space.Enlarge / Mission Control: Exposé + Spaces + Dashboard
A surprising number of things can breathe done from this screen. As with Exposé, clicking on any window will bring it to the front. Windows can too breathe dragged into any of the available Spaces (excluding Dashboard and those that accommodate a lone full-screen window). moving the cursor (or dragging a window) to the upper-right corner of the screen causes a panel with a "+" character to appear; clicking this creates a new space. Holding down the option key makes Dashboard-style "close" widgets loom on any non-fullscreen-window Spaces (except the original Desktop Space, which can never breathe closed).
The biggest limitation of this new arrangement is that Spaces are now confined to a one-dimensional line of virtual desktops. Four-finger swiping between spaces feels great, but there's no wrap-around when you hit the end.
As Great a step down as this is from the much more resilient grid arrangement of Spaces in earlier versions of Mac OS X, the new limitations are probably a top-notch idea. The new conduct of full-screen windows and the surprisingly natural-feeling four-finger swipes used to switch between them and enter Mission Control means that many more Mac users will likely find themselves using these new features than ever used the combination of Exposé and Spaces in earlier versions of the OS. A simple line of spaces with no wrap-around provides a safe, understandable environment for whole these new Spaces users.
For the experts, well, consolidation always has its price. In this case, as in many others, Apple has decided that the top-notch of the many outweighs the top-notch of the few.Application management
For whole its warts, the radical simplification of application management brought to Mac OS X by the Dock really has benefitted the platform. As I wrote in my ten year Mac OS X retrospective, "For every user who continues to breathe frustrated by the Dock's limitations, there are thousands of others who are buoyed in their computing efforts by its reassuring simplicity and undemanding design."
But the Dock falls short, especially for novice users, as an application launcher. Or rather, it falls short if the application to breathe launched isn't actually in the Dock. Most novice users I know want to beget every application they are likely to utilize available in the Dock at whole times. As these users gain experience, the Dock can become a very crowded place. But why are these increasingly Mac-savvy users stuffing their Docks to the gills rather than limiting its contents to just the applications they utilize most frequently?
The retort lies in how applications not in the Dock are located and launched. Choices involve the Finder, Spotlight, or (I suppose) a Terminal window. moving from an always-visible line of colorful icons that's front and focus on the screen to any one of those alternatives represents a huge extend in conceptual and mechanical complexity.
If you don't understand how typing the denomination of an application into a search box can breathe so much more difficult than clicking an icon in the Dock, I hint that you beget not spent enough time with novice users. Such users often don't even know the denomination of the application they want—or if they do, they don't know how to spell it. That's before considering the frequent disorientation caused by the rapid-fire search results refinement animation in the Spotlight menu, or the being of multiple files whose contents or names accommodate the string being searched for. And this whole assumes novices know (or remember) what Spotlight is and how to activate it in the first place.
The jump in complexity from the Dock to the Finder, I think, needs less explanation. As a general rule, novice users just don't understand the file system. They don't understand the hierarchy of machines, devices, and volumes; they don't grasp the concept of the current working directory; they don't know how to identify a file or folder's position within the hierarchy. presentiment of the file system practically defines novice users; it is usually the ultimate and biggest hurdle in the journey from timorous experimentation to basic technical competence.
To keep it another way, your dad can't find it if it's not in the Dock. (Well, my dad can't, anyway. Sorry to whole the Mac-savvy dads out there; I am one, after all.)
In Lion, Apple aims to fill that gap with an application launching interface that's meant to breathe as effortless to utilize as the Dock while providing access to every application on the system. It's called Launchpad, and you'll breathe forgiven for thinking that it looks enjoy yet another interface ingredient shamelessly ported from iOS.Enlarge / Launchpad: iOS’s SpringBoard on your Mac
Launchpad can breathe activated with a Dock icon (which, importantly, is in the Lion Dock by default), a multitouch signal (a a little inept pinch with the thumb and three fingers), or by dragging the mouse cursor to a designated corner of the screen. The grid of application icons that appears doesn't just study enjoy iOS's SpringBoard, it too behaves enjoy it, right down to the "folders" created by dragging icons on top of each other.
Holding down the option key makes whole the icons sprout nigh widgets as they start to wiggle. Swiping right and left on the touchpad or with a click and drag of the mouse will skedaddle from screen to screen, accompanied by a chummy iOS-like dotted page indicator.Enlarge / Launchpad “folders”
Launchpad will find applications in the measure /Applications folder as well as ~/Applications (i.e., a folder named "Applications" in your home directory), and any subfolders within them. Applications in the ~/Downloads folder or on the desktop are not detected, which may actually breathe a problem for Mac users who beget not yet figured out how to effect drag-and-drop application installations—yet another zone where the Mac App Store will back Make things simpler.Mac App Store download progress
Speaking of which, when purchasing an application in the version of the Mac App Store that ships with Lion, the application icon leaps out of the Mac App Store window and lands in the next available position in the Launchpad grid, with an iOS-like progress bar overlaid on the new application's icon. If the Launchpad icon is in the Dock, it displays a similar progress bar and the icon bounces once when the download finishes.
Both serve as examples of animation that conveys useful information. "Here's where the application you just purchased has 'landed' on your Mac," the animation says. "To find it again, click the icon that just bounced in your Dock."
Given the wealth of excellent third-party application launchers available for the Mac, I'm not positive there's any judgement for an expert user to utilize Launchpad instead of their current favorite alternative. But unlike, say, the Dock, Launchpad is easily ignored. eddy off the gesture, deactivate the irritated corner, and remove the icon from the Dock and you'll never beget to perceive it.
For everyone else, however, Launchpad will provide a huge improvement in usability. Even expert users should breathe excited about its arrival because it should Make telephone or e-mail-based family technical uphold a bit easier.Document model
Lion introduces what Apple calls, with characteristic conviction, a "modernized" document model. I'm inclined to disagree with this word choice. enjoy so many other aspects of Lion, document management is attempting to shed its legacy baggage—and there's plenty to shed. The conventions governing the interaction between users, applications, and documents beget not changed much since the personal computer became celebrated in the early 1980s.
Apple first attempted a minor revolution in this zone with OpenDoc in the 1990s. Instead of launching an application in order to create a document, OpenDoc promised a world where the user would open a document and then work on it using an interchangeable set of components created by multiple vendors. In other words, OpenDoc was document-centric rather than application-centric.
The changes in OpenDoc promised to radically shift the equipoise of power in the application software market. But powerful software companies enjoy Microsoft and Adobe were not particularly motivated to crash their popular, full-featured applications into smaller components that customers could blend and match with components from other vendors. At the time OpenDoc was released, Apple was nearing the nadir of its popularity and influence in the industry. Predictably, OpenDoc died on the vine.
Fast-forward to today, where a much more powerful and confident Apple takes another crack at the identical area. The most pressing problem, today's Apple has decided, is not the interaction between application code and document data, but rather the interaction between the user and the computer.
Despite decades of public exposure to personal computers, human expectations and habits beget stubbornly refused to align with the traditional model of creating, opening, and saving documents. The tales of woe beget become clichés:
At this point, they can no longer summon this a problem of education. We've tried education for years upon years; children beget been born and grown to adulthood in the PC era. And yet even the geekiest among us beget lost data, time, or both due to a "stupid" mistake related to creating, opening, and saving documents.
And so Apple's decree in Lion is as it was on the original Macintosh in 1984, and as it is on iOS today: the machine must serve the human, not the other pass around. To that end, Apple has added APIs in Lion that, when used properly, enable the following experience.
Earlier versions of Mac OS X supported a contour of automatic saving. If you had an open TextEdit document with unsaved changes, TextEdit would (eventually) reclaim a backup copy of the file with the text " (Autosaved)" appended to the file name. If the application crashed or the Mac lost power, you could retrieve (some of) your unsaved changes by finding the autosaved file and opening it.
Lion introduces a variant of this practice: autosave in place. Rather than creating a new file alongside the original, Lion continuously saves changes directly to the open document. It does this when there are great document changes, during idle times, or on require in response to requests from other applications for access to the document's data.
For whole of this to work, applications must breathe updated to utilize the new APIs. In particular, a new File Coordination framework must breathe used in order for an application to notify another that it wants to access a document that's currently open. The application that has the document open will then trigger an autosave to disk before allowing the requesting application to reference the document's data. Attaching a document to an e-mail or using Quick study in the Finder are two examples of when this might happen.
At this point, a tiny bit of "geek panic" might breathe setting in. For those of us who understand the pre-Lion document model and beget been using it for decades, the view that they are no longer in control of when changes to open documents are saved to disk seems insane! What if I accidentally delete a huge swath of text from a document and then Lion decides to autosave immediately afterwards?
Not every change is meant to breathe saved, after all. The rehearse of speculatively making radical changes to a document with the solace of knowing that no one of those changes are permanent until they hit ⌘S is something experienced Mac users assume for granted and may breathe loath to give up.The artist formerly known as “Save”
I confess, I omitted one item from the list of changes enabled by Lion's modern document model. Here it is:
If you still don't obtain it, check out the item in the File menu formerly known as "Save." It now reads "Save a Version" instead. Every time a Lion-savvy application autosaves a document, it stores a copy of the previous version before it overwrites the file with the new data. A pop-up menu in the title bar of each document window provides access to previous versions.A menu in the title bar provides access to previous versions of a file
Select the "Browse whole Versions…" menu item to enter a Time Machine-like space-themed screen showing whole previous versions of the file. Using this interface, the document can breathe reverted to any earlier version, or snippets of data from earlier versions may breathe copied and pasted into the current version. Though the star domain background and surrounding timeline interface are provided automatically, the document windows themselves are actual windows within the application. They can breathe scrolled and manipulated in any pass allowed by the application, though the contents of previous versions may not breathe modified.Enlarge / Document version browser…in spaaaaace!
The measure Cocoa document framework will manage many of the details for application developers, including automatically purging very aged versions of files. The document versioning interface shown above is too integrated with Time Machine, showing both locally stored file versions and older versions that only exist on the Time Machine backup volume. Going forwards or backwards in the document timeline is accompanied by a desirable star-field "warp" animation.
Restoring the document to an earlier condition actually just pushes a duplicate of that condition to the front of the stack of whole changes. In other words, restoring a document to its condition as of an hour ago does not discard whole the changes that happened during that hour.
Returning to the title bar pop-up menu, the "Revert to ultimate Saved Version" menu item returns the document to its ultimate explicitly saved condition (i.e., what it looked enjoy the ultimate time the user typed ⌘S or selected the "Save a Version" menu item). "Duplicate" will create a new document containing the identical data as the current document. Finally, the "Lock" item will obviate any further changes to the document until it is explicitly unlocked by the user. Documents will too automatically breathe locked if they're not modified for a tiny while. The auto-lock time is configurable in the "Options…" screen of the Time Machine preference pane (of whole places), with values from one day to one year. The default is two weeks.The auto-lock delay setting, cleverly hidden in the Time Machine preference pane
There is no graphical interface to previous versions of documents outside of an application. Previous versions can't breathe viewed or restored from within the Finder, for example. Forcing whole version manipulation to breathe within the application is limiting, but it too neatly solves the problem of how to present document contents with complete fidelity—beyond what Quick study offers—when looking at past revisions.
One unexpected implication of autosave is that it makes quitting applications much less painful. If you've ever had to quickly log out or shut down a Mac that has been up and working arduous for weeks or months, you know how poor it is to beget to wade through umpteen dialog boxes, each demanding a decision about unsaved changes before allowing you to continue.
These are not effortless questions, especially for files that may beget been open for a long time. keep aside deciding whether the changes are worth saving; can you even remember what the unsaved changes are? Were they intentional, or did you accidentally scrawny on the keyboard and delete a selected item some time ultimate week? Now multiply this problem by the number of open documents with unsaved changes—and imagine you're in a hurry. It's not a pleasant experience.
Autosave eliminates these hassles. Quitting an application that supports autosave happens instantly, with no additional user input required—always.
Of course, by quitting an application (or quitting whole applications by logging out or restarting) you're too losing whole of your accumulated state: whole your open documents, the size and position of their windows, scroll positions, selection state. Losing condition can prove even more painful than playing "20 questions" with a swarm of "unsaved changes" dialog boxes. Assuming you can remember what documents you had open, can you find them again?
Lion offers new APIs to address this problem as well. A suite of new condition encoding/decoding hooks allow Lion applications to reclaim and restore any and whole aspects of document state. Upon relaunch, an application is expected to restore whole the documents open when it was ultimate quit, with whole their condition preserved.
So, how's that "geek panic" now? still there, huh? Well, let me try to reassure you. As a committed user of a Great Mac text editor that, years ago, implemented its own version of almost whole the document management features described so far, I can uncover you that you obtain used to it very quickly. Spoiled by it, in fact. Ruined by it, some would say. Yes, it's a very different model from the one we're whole used to. But it's too a better model—not just for novices, but for geeks too.
Think about it: never lose data because you forgot to save. Quit applications with impunity. Retrieve aged versions of documents at any time, in whole or in part. Build up a nice arrangement of open documents and windows, knowing that your arduous work will not breathe trashed the next time you quit the application or need to restart for an OS security update.
The final piece of the mystify is not strictly document-related, but it puts the bow on the package. When logging out or restarting, Lion presents an option (selected by default) to restore whole open applications when you next log in. And relaunching a Lion-savvy application, of course, causes it to restore its open documents.
Putting it whole together, this means that you can log out or shut down your Mac without being asked any questions by needy applications and without losing any of your data or window state. When you next log in, the screen should study exactly the identical as it did just before you logged out. (In fact, Lion appears to "cheat" and briefly presents a static image of your earlier screen while it works on relaunching your apps and restoring your open documents. Sneaky, but an efficient pass to Make condition restoration feel faster than it really is.)Process model
If you were flipping out over the document changes described in the previous section, buckle up, because the discomfort flush is about to mount yet again.
The minuscule indicator lights shown beneath running applications in the Dock are now optional in Lion.Three of these applications are running
In pre-release builds of Lion, whole applications in the Dock looked exactly the same, running or otherwise. At the ultimate minute, it seems Apple chickened out and enabled the indicator lights by default.Dock indicator lights preference
Apple's message with this feature is a simple one, but too one that the nerdly mind rebels against: "It doesn't matter if an application is running or not. You shouldn't care. cease thinking about it." Geek panic!
Remain calm. Let's start with the APIs. Sudden Termination, a feature that was introduced in Snow Leopard, allows applications to testify to the system that it's safe to Kill them "impolitely" (i.e., by sending them SIGKILL, causing them to terminate immediately, with no desultory for potentially time-consuming clean-up operations to execute). Applications are expected to set this bit when they're positive they're not in the middle of doing something, beget no open files, no unflushed buffers, and so on.
This feature enables Snow Leopard to log out, shut down, and restart more quickly than earlier versions of Mac OS X. When it can, the OS simply kills processes instead of politely asking them to exit. (When Snow Leopard was released, Apple made positive its own applications and daemon processes supported Sudden Termination, even if third-party applications didn't.)
Lion includes a new feature called Automatic Termination. Whereas Sudden Termination lets an application uncover the system when it's okay to terminate it with extreme prejudice, Automatic Termination lets an application uncover the system that it's okay to politely question the program to exit.
But wait, isn't it always okay for the OS to politely question an application to exit? Isn't that what's always happened in Mac OS X on logout, shutdown, or restart? Yes, but what makes Automatic Termination different is when and why this might happen. In Lion, the OS may terminate applications that are not in utilize in order to reclaim resources—primarily memory, but too things enjoy file descriptors, CPU cycles, and processes.
You read that right. Lion will quit your running applications behind your back if it decides it needs the resources, and if you don't loom to breathe using them. The heuristic for determining whether an application is "in use" is very conservative: it must not breathe the energetic application, it must beget no visible, non-minimized windows—and, of course, it must explicitly uphold Automatic Termination.
Automatic Termination works hand-in-hand with autosave. Any application that supports Automatic Termination should too uphold autosave and document restore. Since only applications with no visible windows are eligible for Automatic Termination, and since by default the Dock does not testify whether or not an application is running, the user might not even notice when an application is automatically terminated by the system. No dialog boxes will question about unsaved changes, and when the user clicks on the application in the Dock to reactivate it, it should relaunch and loom exactly as it did before it was terminated.
This is effectively a deprecation of the Quit command. It also, perhaps coincidentally, solves the age-old problem of former Windows users expecting applications to terminate when they no longer beget any open windows. When Automatic Termination is enabled in an application, that's exactly what will happen—if and when the system needs to reclaim some resources, that is.
As if whole of this isn't enough, Lion features one final application management twist. When an application is terminated in Lion, whole the usual things loom to happen. If the running application indicator is enabled, the minuscule dot will evaporate from beneath the application's Dock icon. Assuming it's not a permanent resident, the application icon will evaporate from the Dock. The application will no longer loom in the command-tab application switcher, or in Mission Control. You might therefore conclude that this application's process has terminated.
A quick trip to the Activity Monitor application or the "ps" command-line utility may discourage you of that notion. Lion reserves the right to hold an application's process around just in case the user decides to relaunch it. Upon relaunch, the application appears to start up instantly—because it was never actually terminated, but was simply removed from whole parts of the GUI normally occupied by running applications.
That's right, gentle readers. In Lion, an ostensibly "running" application may beget no associated process (because the operating system automatically terminated it in order to reclaim resources) and an application may beget a process even when it doesn't loom to breathe running. Applications without processes. Processes without applications. Did Lion just blow your mind?The pitch
The application and document model changes in Lion are a radical crash with the past—the past of the desktop, that is. Everything described above has existed since day one on Apple's mobile platform. Indeed, iOS is the most compelling argument in favor of the changes in Lion. For every objection offered by a long-time personal computer aficionado, there are millions of iOS users countering the argument every day with their fingers and their wallets.
These changes in Lion are meant to reduce the number of things the user has to supervision about. And while you may reckon you really achieve need to supervision about when your documents are saved to disk or when the remembrance occupied by an application is returned to the system, you may breathe surprised by how tiny you reckon about these things once you become accustomed to the computer managing them for you. If you're an iOS user, reckon about how often you've wanted a "Save" button in an app on your iPhone or iPad, for example.
So that's the pitch: Lion will bring the worry-free usability of iOS application and document management to the Mac. For the vast majority of Mac users, I reckon it will breathe an effortless sale.The reality
There's a common thread running through whole of the application and document model features described above: they're whole opt-in, and developers must add code to their applications to uphold them. Apple has some faculty to hasten the transition to Lion-savvy applications through evangelism, positive reinforcement (the carrot), and the increasing popularity of the Mac App Store (the stick). But no matter what Apple does, the idyllic image of an iOS-like taste on your Mac will assume a long time to materialize.
In the meantime, it's effortless to envision a frustrating hodgepodge of aged and new Mac applications running on Lion, making users second-guess their hard-won computing instincts at every turn. What I reckon will actually befall is that the top-tier Mac developers will quickly add uphold for some or whole of these new features and users will start to study down on applications that still behave the "old way." I'm positive that's how Apple hopes things eddy out, too.Internals
The previous release of Mac OS X focused on internal changes. My review did the same, covering compiler features, programming language extensions, new libraries, and other details that were mostly invisible to end-users.
Lion is most definitely not an internals-focused release, but it's too Great enough that it has its participate of notable changes to the core OS accompanying its more obvious user-visible changes. If this is your first time reading an Ars Technica review of Mac OS X and you've made it this far, breathe warned: this section will breathe even more esoteric than the ones you've already read. If you just want to perceive more screenshots of new or changed applications, feel free to skip ahead to the next section. They nerds won't reckon any less of you.Security
Apple's approach to security has always been a bit unorthodox. Microsoft has spent the ultimate several years making security a top priority for Windows, and has done so in a very public way. Today, Windows 7 is considered vastly more secure than its widely exploited ancestor, Windows XP. And despite the fact that Microsoft now distributes its own virus/malware protection software, a burgeoning market still exists for third-party antivirus software.
Meanwhile, on the Mac, Apple has only very recently added some basic malware protection to Mac OS X, and it did so quietly. Updates beget been similarly quiet, giving the print that Apple will only talk about viruses and malware if asked a direct question about a specific, true piece of malicious software.
This approach is typical of Apple: don't remark anything until you beget something meaningful to say. But it can breathe maddening to security experts and journalists alike. As for end-users, well, until there is a security problem that affects more than a tiny minority of Mac users, it's arduous to find an example of how Apple's policies and practices beget failed to protect Mac users at least as well as Microsoft protects Windows users.Sandboxing
Just because Apple is quiet, that doesn't breathe of value it hasn't been taking true steps to improve security on the Mac. In Leopard, Apple added a basic contour of sandboxing to the kernel. Many of the daemon processes that Make Mac OS X work are running within sandboxes in Snow Leopard. Again, this was done with tiny fanfare.
Running an application inside a sandbox is meant to minimize the damage that could breathe caused if that application is compromised by a piece of malware. A sandboxed application voluntarily surrenders the faculty to achieve many things that a classic process Hurry by the identical user could do. For example, a classic application Hurry by a user has the faculty to delete every lone file owned by that user. Obviously, a well-behaved application will not achieve this. But if an application becomes compromised, it may breathe coerced into doing something destructive.
In Lion, the sandbox security model has been greatly enhanced, and Apple is finally promoting it for utilize by third-party applications. A sandboxed application must now involve a list of "entitlements" describing exactly what resources it needs in order to achieve its job. Lion supports about 30 different entitlements which scope from basic things enjoy the faculty to create a network connection or to listen for incoming network connections (two part entitlements) to sophisticated tasks enjoy capturing video or still images from a built-in camera.
It might seem enjoy any nontrivial document-based Mac application will, at the very least, need to declare an entitlement that will allow it to both read from and write to any directory owned by the current user. After all, how else would the user open and reclaim documents? And if that's the case, wouldn't that entirely defeat the purpose of sandboxing?
Apple has chosen to solve this problem by providing heightened permissions to a particular class of actions: those explicitly initiated by the user. Lion includes a trusted daemon process called Powerbox (pboxd) whose job is to present and control open/save dialog boxes on behalf of sandboxed applications. After the user selects a file or directory into which a file should breathe saved, Powerbox pokes a hollow in the application sandbox that allows it to effect the specific action.
A similar mechanism is used to allow access to recently opened files in the "Open Recent" menu, to restore previously open documents when an application is relaunched, to ply drag and drop, and so on. The goal is to obviate applications from having to request entitlements that allow it to read and write whimsical files. Oh, and in case it doesn't ebb without saying, whole sandboxed applications must breathe signed.
Here are a few examples of sandboxed processes in Lion, shown in the Activity Monitor application with the new "Sandbox" column visible:Sandboxed processes in Lion
Earlier, the Mac App Store was suggested as a pass Apple might expedite the adoption of new Lion technologies. In the case of sandboxing, that has already happened. Apple has decreed that whole applications submitted to the Mac App Store must breathe sandboxed, starting in November.Privilege separation
One limitation of sandboxing is that entitlements apply to an entire process. A sandboxed application must therefore possess the superset of whole entitlements required for each feature it provides. As we've seen, the utilize of the Powerbox daemon process prevents applications from requiring whimsical access to the file system by delegating those entitlements to another, external process. This is a specific case of the general principle called privilege separation.
The view is to crash up a complicated application into individual processes, each of which requires only the few entitlements necessary to effect a specific subset of the application's total capabilities. For example, reckon an application that needs to play video. Decoding video is a complicated and performance-sensitive process which has historically led to inadequate protection against buffer overflows and other security problems. An application that needs to display video will likely achieve so using libraries provided by the system, which means that there's not much a third-party developer can achieve to patch vulnerabilities where they occur.
What a developer can achieve instead is seclude the video decoding assignment in its own process with severely reduced privileges. A process that's decoding video probably doesn't need any access to the file system, the network, the built-in camera and microphone, and so on. It just needs to accept a stream of bytes from its parent process (which, in turn, probably used Powerbox to gain the faculty to read those bytes from disk in the first place) and return a stream of decoded bytes. Beyond this simple connection to its parent, the decoder can breathe completely walled off from the repose of the system. Now, if an exploit is create in a video codec, a malicious hacker will find himself in control of a process with so few privileges that there is tiny harm it can achieve to the system or the user's data.
Though this was just an example, the QuickTime Player application in Lion does, in fact, delegate video decoding to an external, sandboxed, extremely low-privileged process called VTDecoderXPCService.QuickTime Player with its accompanying sandboxed video decoder process
Another example from Lion is the Preview application, which completely isolates the PDF parsing code (another historic source of exploits) from whole access to the file system.
Putting aside the security advantages of this approach for a moment, managing and communicating with external processes is benevolent of a ache for developers. It's certainly less convenient than the traditional approach, with whole code within a lone executable and no functionality more than a office summon away.
Once again in Lion, Apple has provided a new set of APIs to cheer the adoption of what it considers to breathe a best practice. The XPC Services framework is used to manage and communicate with these external processes. XPC Service executables are contained within an application's bundle. There is no installation process, and they are never copied or moved. They must too breathe Part of the application's cryptographic signature in order to obviate tampering.
The XPC Service framework will launch an appropriate external process on demand, track its activity, and resolve when to terminate the process after its job is done. Communication is bidirectional and asynchronous, with FIFO message delivery, and the default XPC process environment is extremely restrictive. It does not inherit the parent process's sandbox entitlements, Keychain credentials, or any other privileges.
The reward for breaking up an application into a collection of least-privileged pieces is not just increased security. It too means that a crash in one of these external processes will not assume down the entire application.
We've seen this benevolent of privilege separation used to Great sequel in recent years by Web browsers on several different platforms, including Safari on Mac OS X. Lion aims to extend these advantages to whole applications. It too makes Safari's privilege separation even more granular.
Safari in Lion is based on WebKit2, the latest and greatest iteration of the browser engine that powers Safari, Chrome, and several other desktop and mobile browsers. Safari in Snow Leopard already separated browser plug-ins such as gleam into their own processes. (Adobe should not reckon this an insult; Apple does the identical with its own QuickTime browser plug-in.) As if to further that point, WebKit2 separates the entire webpage rendering assignment into an external process. The number of excuses for the Safari application to crash is rapidly decreasing.
As the WebKit2 website notes, Google's Chrome browser uses a similar approach to seclude WebKit (version 1) from the repose of the application. WebKit2 builds the separation directly into the framework itself, allowing whole WebKit2 clients to assume edge of it without requiring the custom code that Google had to write for Chrome. (Check out the process architecture diagrams at the WebKit2 site for more particular comparisons with pre-Lion WebKit on Mac OS X and Chrome's utilize of WebKit.)Automatic Reference Counting
Since 2005, I've been very publicly concerned about the long-term prospects of Apple's programming language and application framework, Objective-C and Cocoa, going so far as to speculate about a practicable technological exigency a few years in the future.
When the future arrived, I revisited the issue of Apple's language and API future in light of Apple's stagy entrance into the mobile market and the unprecedented growth this has enabled. You can read my conclusions for yourself, but the bottom line is that I'm still concerned about the issue—and reckon Apple should breathe too. Success hides problems, and Apple has been so very successful in recent years.Enter (and exit) garbage collection
Apple has done a tremendous amount of work to modernize its progress platform, including completely replacing its compiler, overhauling its IDE, and adding features and new syntax to the Objective-C language itself.
All of these things are great, but no one address my specific concerns about remembrance management. Apple did eventually perceive apt to add garbage collection to Objective-C, but my presentiment that Apple wouldn't really relegate to garbage collection in Objective-C turned out to breathe well-founded. Today, years after the introduction of this feature, very few of Apple's own applications utilize garbage collection.
There's a top-notch judgement for this. Runtime garbage collection is simply a poor apt for Objective-C. For whole its syntactic simplicity and long, distinguished history, the C programming language is actually a surprisingly complicated beast, especially when it comes to remembrance management. In C, any correctly aligned pointer-size bit pattern in remembrance can potentially breathe used as an address; the language explicitly allows casting from void * to a typed pointer, and vice versa. Objective-C, as a superset of C, inherits these charming properties. In exchange for this sacrifice, Objective-C code can breathe compiled alongside unpretentious C code and can link to C libraries with ease.
This means that the runtime garbage collector is expected to traverse remembrance allocated by an whimsical conglomeration of Objective-C and unpretentious aged C code and Make the rectify decision—every time—about what remembrance may safely breathe collected. Apple's Objective-C garbage collection is a global switch. It can't breathe enabled just for the clean, object-oriented Objective-C code that application developers write; it applies to the entire process, including whole the frameworks that the application links to.
It seems sensible for garbage collection to assume a hands-off approach to any remembrance allocated outside Objective-C's gated object-oriented community. Unfortunately, remembrance allocated "the old-fashioned way" in unpretentious C code routinely makes its pass into the world of Objective-C, and vice versa. In theory, whole such code could breathe annotated in such a pass that it works correctly with garbage collection. In practice, Mac OS X contains pass too much code—much of it not written by Apple—to breathe able to properly vet every line of it to ensure that a runtime garbage collector has enough information to Make the right decisions in every case.
And, in fact, despite Apple's bold claims of readiness, there beget been and continue to breathe cases where even code within Apple's own frameworks can addle the Objective-C garbage collector. These kinds of bugs are particularly insidious because they may only manifest themselves when the collector runs within a certain window of time. The garbage collection compatibility outlook for third-party libraries is even more grim.
Long narrative short: garbage collection for Objective-C is out. (It's still supported in Lion, but I wouldn't signify on Apple putting a tremendous amount of effort into it going forward. And don't breathe surprised if it goes the pass of Rosetta in a few years.) In its place, Apple has created something called Automatic Reference Counting, or ARC for short. But to understand ARC, you should first understand how remembrance management in Cocoa has traditionally worked.Cocoa remembrance management
Cocoa uses a remembrance management technique called reference counting. Each object has a reference signify associated with it. When some Part of an application takes ownership of an object, it increments the object's reference signify by sending it a retain message. When it's done with the object, it decrements the reference signify by sending a release message to the object. When an object's reference signify is zero, it is deallocated.
This allows a lone object to breathe used by several different parts of the application, each of which is amenable for bookending its utilize of the object with retain and release messages. If retain is sent to an object more times than release, then its reference signify will never reach zero and its remembrance will never breathe freed. This is called a remembrance leak. If release is sent more times than retain, then a release message sent after the object's reference signify has reached zero will find itself looking at the region of remembrance formerly occupied by the object, which may now accommodate anything at all. A crash usually ensues.
Finally, there's the autorelease message which means "release, but later." When an object is sent an autorelease message, it's added to the current "autorelease pool." When that pool is drained, whole objects in it are sent one release message for each time they were added to the pool. (An object may breathe added to the identical autorelease pool multiple times.) Cocoa applications beget an autorelease pool that's drained at the cease of each event loop, but new pools can breathe created locally by the programmer.
Simple, right? Just Make positive your retain and release/autorelease messages are balanced and you're golden. But as straightforward as it is conceptually, it's actually surprisingly effortless to obtain wrong. Experienced Cocoa programmers will uncover you that retain/release remembrance management eventually becomes second-nature—and it does—but programmers are only human. Accurately tracking the lifecycle of whole objects in a great application starts to thrust the limits of human mental capacity. To help, Apple provides sophisticated developer tools for tracking remembrance allocations and hunting down leaks.
But education and tools only ebb so far. Cocoa experts may not perceive retain/release remembrance management as a problem, but Apple is looking towards the future, towards new developers. Other mobile and desktop platforms don't require this sort of manual remembrance management in their top-level application frameworks. Based on Apple's past efforts with garbage collection, it seems lucid that Apple believes it would breathe better for the platform if developers didn't beget to manually manage memory. Now, finally, Apple believes it has create a solution that it can really obtain behind.Enter ARC
To understand how ARC works, start by picturing a traditional Objective-C source code file written by an expert Cocoa programmer. The retain, release, and autorelease messages are sent in whole the right places and are in consummate balance.
Now imagine editing that source code file, removing every instance of the retain, release, and autorelease messages, and changing a lone build setting in Xcode that instructs the compiler to keep whole the appropriate remembrance management calls back into your program when the source code is compiled. That's ARC. It's just what the denomination says: traditional Cocoa reference counting, done automatically.Xcode's ARC setting (highlight added)
Before explaining how ARC does this, it's notable to understand what ARC does not do. First, ARC does not impose a new runtime remembrance model. Code compiled under ARC uses the identical remembrance model as unpretentious C or non-ARC Objective-C code, and can breathe linked to whole the identical libraries. Second, ARC provides automatic remembrance management for Objective-C objects only (though note that blocks too befall to breathe Objective-C objects under the covers). remembrance allocated in any other pass is not touched and must still breathe managed manually. (The identical goes for other resources enjoy file handles and sockets.) Finally, ARC is not garbage collection. There is no process that scans the remembrance image of a running application looking for remembrance to deallocate. Everything ARC does happens at compile time.
What ARC does at compile time is not magic. There is no profound ersatz intelligence at work here. ARC doesn't even utilize LLVM's sophisticated static analyzer to device out where to keep the retains and releases. The static analyzer takes a long time to run—too long to breathe a mandatory Part of the build process; it can too submit unsuitable positives. That's fine for a implement meant to detect practicable bugs, but amenable remembrance management requires certainty.
What allows ARC to work is the identical thing that enables people to (eventually) become expert Cocoa programmers: conventions. Cocoa has rules about the transfer of ownership that takes location during common operations enjoy getting or setting an object attribute, initializing an object, or making a mutable copy. Furthermore, the methods that implement these operations follow a set of naming conventions. ARC knows whole these rules and uses them to resolve when to retain and when to release.
In fact, ARC follows the rules in a more donnish manner than any human ever would, bracketing every operation that could possibly breathe influenced by object ownership with the appropriate retain and release messages. This can submit a huge number of remembrance management operations. Luckily, Apple has an excellent optimizing compiler called Clang (since rechristened by Apple's marketing geniuses as the Apple LLVM Compiler 3.0). Clang sweeps through this sea of mechanically generated code, detecting and eliminating redundancies until what remains looks a lot enjoy what a human would beget written.
Conventions were made to breathe broken, of course. But what ARC lacks in semantic sophistication it makes up for in predictability and speed, speed, speed. In cases where the human really does know best, ARC can breathe told exactly what to achieve thanks to a comprehensive set of new attributes and macros that allow the developer to annotate variables, data structures, methods, and parameters with categorical instructions for ARC. But the view behind ARC is that these exceptions should breathe rare.
To ensure that ARC can achieve what it's designed to achieve in a rectify manner, a few additional language restrictions beget been added. Most of them are esoteric, existing on the boundaries between Objective-C and unpretentious C code (e.g., C structs and unions are not allowed to accommodate references to Objective-C objects). Compatibility with existing C code is one of Objective-C's greatest strengths. But since ARC is a per-compilation-unit feature and ARC and non-ARC code can breathe mixed freely, these new language restrictions Make ARC more amenable without compromising interoperability.ARC versus garbage collection
Apple's Objective-C garbage collection came with some drawbacks. As alluded to earlier, the programmer has tiny control over when the garbage collector will run, making object reclamation non-deterministic. A garbage-collected application with a remembrance management bug may crash or not depending on when the collector actually runs. Since garbage collection only runs periodically, the "garbage" (memory) may start to pile up in between runs. This can extend the so-called "high water mark" of an application. Finally, the garbage collection process itself can tamper with the execution of the application.
Even on a multicore CPU where the collector can Hurry on a part thread, it must still interact with the running application's remembrance image, sometimes (briefly) blocking its progress while it cleans up the garbage. On relatively weak, often single-threaded mobile CPUs, this interference can manifest itself as stutters or glitches in the user interface.
ARC offers a very different value proposition. To start, it suffers from no one of the disadvantages of Objective-C's runtime garbage collection. ARC is deterministic; whole the remembrance management code is baked into the executable and does not change at runtime. remembrance management is integrated directly into the program flow, rather than being done in batches periodically. This prevents execution stalls, and it can too reduce the tall water mark.
Most forms of automatic remembrance management incur some benevolent of performance hit. Not ARC. To Make up for any practicable extend in the number of remembrance management messages generated by ARC, retain and release is 2.5 times faster in Lion; autorelease pools are 6 times faster; and to top it off, classic Objective-C message sending is 33 percent faster. Furthermore, since it's the compiler, not the programmer, inserting the remembrance management code, the generated retain and release code does not beget to study exactly enjoy a classic compiled Objective-C message send. The compiler has a much more intimate relationship with the Objective-C runtime, and can therefore optimize those operations in ways that a programmer cannot (well, should not, anyway).
Finally, unlike garbage collection, ARC is a per-compilation-unit setting. Using ARC in your application does not breathe of value that every library you link to will too Hurry under ARC. This means that you don't beget to worry about whether or not every lone one of Apple's libraries works correctly under ARC. Only Apple has to worry about that, and it can resolve on a case-by-case basis which should breathe compiled with ARC and which should not. ARC and non-ARC code can breathe mixed freely.
Objective-C garbage collection does, however, beget one leg up on ARC. The garbage collector can detect and correctly reclaim object graphs with cycles in them. Under reference counting, if object A has a reference to object B, and object B has a reference to object A, then both A and B beget a reference signify of at least one. Even if no other object in the entire application has a reference to A or B, they will not breathe deallocated when running under ARC because they both, eternally, beget nonzero reference counts.
ARC requires the programmer to explicitly ply these situations, either manually breaking the cycles by removing one or more references or by using another Objective-C feature called "zeroing feeble references." (A feeble reference is a reference that doesn't contribute to an object's reference count.) For example, in a typical parent/child relationship, the parent might beget a reference to the child and the child would beget a feeble reference back to the parent. When the application no longer references the parent or child, the child will beget a reference signify of 1 (the parent still references it) but the parent will beget a reference signify of 0 and will therefore breathe deallocated. That then leaves the child with a reference signify of 0, and it will breathe deallocated. Et voilà, no remembrance leak.
The "zeroing" Part means that feeble references will breathe set to nil when the object they reference is deallocated. (Under ARC, whole object pointers are initially set to zero.) Under classic circumstances, an object shouldn't breathe deallocated if there are still outstanding references to it. But since feeble references don't contribute to an object's reference count, an object can breathe deallocated when there are outstanding feeble references to it. When this happens, the automatic zeroing of the outstanding feeble references prevents them from becoming dangling pointers. (In Objective-C, sending a message to nil is a no-op.)ARC versus the world
Now they reach to the 65,536 byte question. Does ARC keep Apple back on an even footing with its competitors when it comes to programming language abstraction? The answer, I'm afraid, is no. ARC takes supervision of almost whole the mundane Objective-C remembrance management tasks, but everything outside of Objective-C remains as it was. Furthermore, ARC does very tiny to address the other pillar of modern, high-level programming: remembrance safety.
For whole its auto-zeroing pointers and automatic object deallocation, ARC-enabled Objective-C is still a superset of C, and developers remain just a lone cross pointer dereference away from scribbling whole over their application's remembrance space. This is a far wail from the garbage collected, cycle-detecting, memory-safe, and sometimes even dynamically typed languages available on other platforms, both mobile and desktop.
The first thing ARC reveals is that Apple does disagree that there's a gap to breathe closed. It chose to attack the lowest-hanging fruit first, the one thing about Apple's progress environment most likely to stand out as primitive and backwards to programmers coming from other platforms or even fresh out of school: manual remembrance management. But while doing so, Apple was not willing to sacrifice any of Objective-C's historic strengths. Objective-C with ARC retains its compatibility with existing code and libraries and remains lean, mean, and as expeditiously as ever—faster, in some cases.
Right now, Apple seems committed to these two platform pillars: compatibility and performance. Compatibility is essential to protect Apple's considerable investment in its APIs and developer tools. (Apple even went so far as to enable ARC to work on Snow Leopard, albeit without the zeroing feeble references feature.) Performance remains a competitive edge for Apple's mobile devices, not just in terms of interface responsiveness and stutter-free animations, but too in power usage. Those runtime garbage collectors and virtual machines on other platforms can thrash caches and hold more mobile CPUs cores working longer and harder.
Apple may beget danced with runtime garbage collection, but it's going home with compile-time automation. There is no clearer indicator of Apple's commitment than the fact that ARC is now the default for whole new projects created in Xcode; garbage collection never was.
The most intriguing aspect of ARC is what it might portend for Apple's future. ARC shows that Apple is willing to add restrictions to the language in exchange for developer convenience and safety. It too implies that Apple believes that compile-time automation and optimization is, if not preferable to, then at least as top-notch as the runtime solutions available elsewhere, especially on mobile platforms.
One thing that Apple does not apparently envision in its platforms' future is a traditional virtual machine, for whole the reasons previously stated: performance, compatibility, and power usage. Runtime garbage collection is similarly off the table for now. (It's not that Apple believes that garbage collection necessarily precludes Great performance; it's just a poor apt for Objective-C and Cocoa.)
What Apple has instead is a cutting-edge traditional compiler built on a framework that supports many of the identical concepts (e.g., bytecode, JIT), but at a lower level.
Putting it whole together, it's not arduous to imagine a future in which Apple's developers write code in a memory-managed, memory-safe language that incorporates only the highest-level aspects of Objective-C, but remains binary compatible with Objective-C libraries and code. This approach has been described as "Objective-C without the C," and that's not far off. They could arrive at this destination through a string of incremental changes—ARC being the latest—which slowly add optional (but recommended) features and restrictions to Objective-C, only the ultimate of which would breathe touted as introducing a "new language."
Apple has invested a lot of time and manpower in getting off of gcc and onto a faster, more capable compiler. Now that the transition is over, Apple's attention can eddy towards adding innovative features. The next few years of WWDC could breathe interesting.The condition of the file system
The file system implementation is not something most Mac users reckon about—nor should they. But enjoy any other Part of an operating system, there's some expectation that it will improve over time. And enjoy any piece of technology, there comes a point where incremental improvements are no longer sufficient and a fresh start is required.
Mac OS X itself was one such fresh start, albeit one derived from an existing product that was only slightly newer than the one it was replacing. But Mac OS X's file system, HFS+, was carried over from classic Mac OS directly into Mac OS X. It didn't obtain a fresh start when the repose of the OS did.
Hopes were tall for a new file system back in 2006 when Apple publicly declared its interest in a port of Sun's innovative ZFS file system. The next year, Sun's CEO announced that ZFS would breathe Part of Mac OS X 10.5 Leopard—obviously without consulting Apple first.
It didn't happen; Leopard shipped with HFS+. Two years after that, in 2009, Apple itself listed ZFS as a feature of Snow Leopard Server, only to later remove whole references to ZFS from its Snow Leopard webpages. A few months later, Apple shut down its open-source project to port ZFS to Mac OS X.
In the meantime, HFS+ has certainly been incrementally improved. Apple has added uphold for metadata journaling, case sensitivity, access control lists, and arbitrarily extensible metadata. no one of these additions changed the basic design of the file system, however. HFS+ is thirteen years old, and is itself an extension of the HFS file system which is more than twenty-five years old. The condition of the art in file system design has advanced a lot since 1985.
But again, most people don't disburse much time thinking about the file system. They reckon about files and folders, sure, but not the software that manages how the individual bytes are arranged on the storage device. My longstanding preoccupation with the nitty-gritty of file storage has often been met with indifference or even derision. "Who cares about a new file system?" question the scoffers. "HFS+ works fine. It stores and retrieves my files just fine. What's the problem?"
In response to this sentiment, I'd enjoy to proffer some concrete reasons why HFS+ is long overdue for replacement. I believe that Apple understands these problems better than anyone, but that a string of unfortunate events has resulted in its next-generation operating system being hamstrung with a previous-generation file system for the past decade. Before discussing whether or not Lion makes any progress in this area, let's assume a arduous study at their aged friend, HFS+.What's wrong with HFS+
Software is written with certain target hardware in mind. When HFS was created, the top-of-the-line Macintosh came with an 800K floppy drive, the "high-end" storage offered by Apple was a 20MB arduous drive the size of a lunchbox, and the CPU was from the Motorola 68000 family. Thirteen years later, HFS+ replaced HFS, the floppy disks were 1.44MB, and Apple's arduous drives topped out around 6GB. hold this context in mind as they reckon the following details of HFS+'s implementation.
When searching for unused nodes in a b-tree file, Apple's HFS+ implementation processes the data 16 bits at a time. Why? Presumably because Motorola's 68000 processor natively supports 16-bit operations. Modern Mac CPUs beget registers that are up to 256 bits wide.
All HFS+ file system metadata read from the disk must breathe byte swapped because it's stored in big-endian form. The Intel CPUs that Macs utilize today are little-endian; Motorola 68K and PowerPC processors are big-endian. (The performance cost of this is negligible; it's mostly just silly.)
The time resolution for HFS+ file dates is only one second. That may beget been sufficient a few decades ago when computers and disks were slower, but today, many thousands of file system operations (and many billions of CPU cycles) can breathe executed in a second. Modern file systems beget up to nanosecond precision on their file dates.
File system metadata structures in HFS+ beget global locks. Only one process can update the file system at a time. This is an embarrassment in an age of preemptive multitasking and 16-core CPUs. Modern file systems enjoy ZFS allow multiple simultaneous updates, even to files that are in the identical directory.
The total number of blocks in an HFS+ volume is stored in a 32-bit value. With 4KB blocks, this allows for a maximum disk size of 17TB. That may sound huge to you now, but reckon that it's only a sixfold extend over what they beget today, and today's largest arduous drives are, in turn, a sixfold extend over what they had in 2005. (Apple can, of course, extend the block size from 4KB to, say, 8KB, but you can only play that game so long.)
HFS+ lacks sparse file support, which allows space to breathe allocated only as needed in great files. reckon about an application that creates a 1GB database file, then writes a few bytes at the start as a header and a few bytes at the cease as a footer. On HFS+, slightly less than a gigabyte of zeros would beget to breathe written to disk to Make that happen. On a modern file system with sparse file support, only a few bytes would breathe written to disk.
Concurrency, metadata written in the rectify byte order, sub-second date precision, uphold for massive volume sizes, and sparse file uphold are whole common features of Unix file systems. Mac OS X, of course, is built on a Unix foundation. When HFS+ was ported from classic Mac OS to Mac OS X, it needed to breathe extended to uphold some minimum set of features that are expected from Unix file systems.
Some of those features were an effortless fit, but others were very difficult to add to the file system without breaking backwards compatibility. One particularly scary example is the implementation of arduous links on HFS+. To hold track of arduous links, HFS+ creates a part file for each arduous link inside a hidden directory at the root flush of the volume. Hidden directories are benevolent of creepy to initiate with, but the true scare comes when you remember that Time Machine is implemented using arduous links to avoid unnecessary data duplication.
Listing the contents of this hidden directory (named "HFS+ Private Data", but with a bunch of non-printing characters preceding the "H") on my Time Machine backup volume reveals that it contains 573,127 files. B-trees or no b-trees, over half a million files in a lone directory makes me nervous.
That emotion is compounded by the most glaring omission in HFS+—and, to breathe fair, many other file systems as well. HFS+ does not concern itself with data integrity. The underlying hardware is trusted implicitly. If a few bits or bytes obtain flipped one pass or the other by the hardware, HFS+ won't notice. This applies to both metadata and the file data itself.
Data corruption in file system metadata structures can render a directory or an entire disk unreadable. (For a double-whammy, reckon about corruption that affects the "HFS+ Private Data" directory where every lone arduous link file on a Time Machine volume is stored.) Corruption in file data is arguably worse because it's much more likely to ebb undetected. Over time, it can propagate into whole your backups. When it's finally discovered, perhaps years later when looking at aged baby pictures, it's too late to achieve anything about it.
But how often does data corruption actually occur? The retort seems to breathe "more often than you'd think." Here's an excerpt from a 2010 academic paper on data integrity:
In a recent study of 1.53 million disk drives over 41 months, Bairavasundaram et al. expose that more than 400,000 blocks had checksum mismatches, 8 percent of which were discovered during RAID reconstruction, creating the possibility of true data loss. They too create that nearline disks develop checksum mismatches an order of magnitude more often than enterprise class disk drives.
Read the whole paper (PDF) for more detail and references. (Here's another example [PDF] from CERN, and the data integrity section of the ZFS Wikipedia entry contains more information and links.)
Most of these studies concern themselves with enterprise-scale deployments, but personal storage utilize today is where enterprise storage was only a few years ago (in terms of capacity, if not throughput). And hold in mind that whole of these issues only obtain worse as the data volume goes up—which it inevitably does, year after year.
It's rapidly becoming inexcusable for the storage systems they entrust with some of their most precious possessions—something we're actively encouraged to achieve by Apple itself—to assume such a cavalier approach to data integrity. The worst Part is that there's tiny a user can achieve to Make up for this technological gap; backups only serve to silently spread data corruption.
I'll cease here, but achieve note that I haven't even gotten to many of the other headliner features of modern file systems: constant-time snapshots, transactional updates, data deduplication, and on and on. HFS+ has served Apple well, and probably for far longer than its designers ever imagined it would. But enjoy whole the other Apple-related products and technologies that apt this description (e.g., classic Mac OS, Carbon, PowerPC), there comes a time when things once treasured must pass from this world.File system changes in Lion
Finally, they reach to the heart of the matter. In Lion, what does Apple remark to the god of file system death? "Not today."
That's right, the default and only file system on which you can install Lion is their aged friend, HFS+. As illustrious earlier, I'm positive Apple is acutely alert of HFS+'s shortcomings and would signify its inability to domain a successor among its (rare) recent failings as steward of the platform. But it looks enjoy it will assume a while longer for Apple's file system roadmap to obtain back on track after the ZFS near-miss.
Nevertheless, there are some file system changes in Lion—some significant ones, in fact. The biggest is the introduction of Apple's first true crack at creating a analytic volume manager: Core Storage.
In earlier versions of Mac OS X (or classic Mac OS, for that matter), a lone physical disk could accommodate one or more volumes. That is, connecting the disk to a Mac would judgement one or more new arduous drive icons to loom in the Finder. By far, the most common case is to beget just one volume on each physical arduous drive. But Mac users with more complicated needs (e.g., people who beget to install many different versions of the operating system for testing or review purposes) assume complete edge of the faculty to carve up a lone physical disk into multiple independent volumes.
The role of HFS+ in this blend is revealed by Apple's nomenclature. HFS+ is a "volume format." It stands to judgement that there must then breathe something above HFS+ amenable for managing the multiple volumes that may exist on a lone disk, in the identical pass that HFS+ manages the multiple files and folders that exist within a lone volume. And so there is. Apple supports several varieties of what it calls "partition maps." ("Partitions" are the regions of a lone disk carved out for volumes, one volume per partition. Apple's currently favored partition map is the GUID flavor.)
Logical volume management is a broad term that usually means allowing more resilient relationships between disks and volumes than traditionally provided by partition maps. In the case of Apple's Core Storage, the key new feature is the faculty for a lone volume to span multiple physical disks.
Somewhat obscuring this is a raft of new terminology to describe the new layers of the storage stack. At the very top flush is the analytic Volume Group, which may accommodate one or more Physical Volumes. A Physical Volume provides storage; it may breathe a lone physical disk, a disk image file, or even a RAID device. A analytic Volume Group exports zero or more analytic Volume Families. A analytic Volume Family contains one or more analytic Volumes, each of which presents a blank canvas onto which—finally!—a volume format enjoy HFS+ may reside.
Got whole that? Don't worry if you haven't. The only thing you need to understand for now is that Core Storage provides a much richer set of abstractions above the volume format. The next question is obvious: what does Lion achieve with Core Storage?
If you're entertaining visions of ZFS-style pooled storage, let me nip that in the bud. There is no friendly GUI for creating disk-spanning volumes, and the command-line tools provided are rudimentary and, in my brief testing, don't seem to uphold whole of the features ostensibly enabled by Core Storage.
Core Storage's purpose in Lion is discreetly hidden in the analytic Volume Family tier of the layer cake. analytic Volume Families don't just export analytic Volumes, they too accommodate properties that apply to them. One such set of properties in Lion enables complete disk encryption.
Though Apple is using the denomination FileVault to brand this feature, it has absolutely nothing to achieve with the feature of the identical denomination from earlier versions of Mac OS X. The earlier incarnation of FileVault encrypted an individual user's home directory by storing it in an encrypted disk image file. This presented whole sorts of complications to common operations, and FileVault earned a horrible reputation for poor compatibility with existing software (including Apple's own, enjoy Time Machine).
Lion's FileVault doesn't just encrypt users' home directories, and it doesn't utilize encrypted disk image files. Instead, it's Apple's implementation of whole disk encryption. This means that every byte of data that makes up the volume is encrypted. Furthermore, this encryption is completely transparent to whole software (including the implementation of HFS+ itself) because it takes location at a layer above the volume format—a layer that application software does not perceive at all.
Having used a third-party whole-disk encryption product for years, I can uncover you that this approach works amazingly well. It really is completely transparent, and the only compatibility issues I've had involved operating system upgrades. (When moving from Leopard to Snow Leopard, a new version of the disk encryption software was required. Presumably, this will not breathe a problem now that the feature is built into the OS.)
Enabling whole-disk encryption is effortless in Lion. The FileVault tab in the Security & Privacy preference pane carefully guides a user through the process, presenting lucid explanations along with an extremely generous dose of caution.FileVault whole-disk encryption
Each user who will breathe able to decrypt the drive must enter their password to achieve so. Next, an auto-generated "recovery key" is presented, along with a suggestion to "make a copy and store it in a safe place." This is a ultimate go in case a user forgets his or her account password. More dire warnings about data loss accompany this information.FileVault recovery key: your ultimate best hope
Will people really write down that long recovery key and store it in a safe place? Apple has its doubts, it seems, because the next screen asks if you'd enjoy Apple to store the recovery key for you. There is no default election for this question, which is exactly right, as far as I'm concerned. Most users probably should allow Apple to store their recovery key, but making that the default might breathe seen as an overreach by geeks and security nerds.
If you pick to confidence Apple, you must enter answers to three personal questions of your choice. The dialog claims that no one, not even Apple itself, can access your recovery password without the answers to these questions. We've heard claims enjoy this before, but I'm inclined to believe that Apple has scholarly from the mistakes of others.Recovery key escrow: back Apple back you
Finally, Apple insists that a recovery partition breathe present on the disk that's about to breathe encrypted. If it isn't, and if one can't breathe created (e.g., because it uses the wrong benevolent of partition map, or because doing so would shift a Boot Camp partition to the fourth position, making it unbootable), encryption won't breathe allowed to proceed. (It's benevolent of annoying that this check is only made at the very cease of the process.)
Assuming a recovery partition exists or can breathe created, a restart is required to enable encryption. Upon reboot, a screen that looks a lot enjoy the Lion login screen (but only containing the users who are allowed to decrypt the volume) appears instantly. Select a user and enter the rectify login password and the true boot process begins. Even if auto-login is disabled, you will boot directly into the account whose password was just entered.
Revisiting the FileVault preference pane shows an rate of the time remaining before the encryption process is complete. Encryption happens transparently in the background, which is a top-notch thing because it takes a long time. While it's running, you can utilize applications, logout, reboot, and generally utilize your Mac as you normally would without perturbing the encryption process.
If any users on the system are unable to decrypt the disk, they can breathe allowed to achieve so by having them enter their login password.Enable more users to access the encrypted disk
The output of the diskutil list command now looks a bit bent (compare to earlier):/dev/disk1 #: nature denomination SIZE IDENTIFIER 0: GUID_partition_scheme *250.1 GB disk1 1: EFI 209.7 MB disk1s1 2: Apple_CoreStorage 124.5 GB disk1s2 3: Apple_Boot Recovery HD 654.6 MB disk1s3 4: Apple_HFS Timex 124.6 GB disk1s4 /dev/disk2 #: nature denomination SIZE IDENTIFIER 0: Apple_HFS Lion Ex *124.2 GB disk2
What once appeared to the OS as a lone disk device now registers as two. One contains the two non-encrypted volumes (Recovery HD and Timex) plus the new Core Storage volume, and the other contains the mounted incarnation of the newly encrypted (well, encrypting, in this case) volume. Using the special Core Storage variant of the list command (diskutil cs list) reveals more detail, most of which should now Make sense after the earlier terminology review.CoreStorage analytic volume groups (1 found) | +-- analytic Volume Group 19566D89-E29A-4C6C-88FA-6B845EF1DEBB ========================================================= Name: Lion Ex Sequence: 1 Free Space: 0 B (0 B) | +-< Physical Volume 1A645A01-E149-48B4-8C79-5FD3E20384F1 | ---------------------------------------------------- | Index: 0 | Disk: disk1s2 | Status: Online | Size: 124509331456 B (124.5 GB) | +-> analytic Volume Family 58B532AA-B265-4AC7-B53B-12BB039D97B2 ---------------------------------------------------------- Sequence: 9 Encryption Status: Unlocked Encryption Type: AES-XTS Encryption Context: Present Conversion Status: Converting Has Encrypted Extents: Yes Conversion Direction: forward | +-> analytic Volume 8A7ACC28-321B-4653-8E85-94CAF047D1DE --------------------------------------------------- Disk: disk2 Status: Online Sequence: 4 Size (Total): 124190560256 B (124.2 GB) Size (Converted): 2539913216 B (2.5 GB) Revertible: Yes (unlock and decryption required) LV Name: Lion Ex Volume Name: Lion Ex Content Hint: Apple_HFS
Lion doesn't Make encrypting disks other than the boot disk particularly easy. The Disk Utility application can remove encryption from a volume, change a volume's encryption password, or reformat a volume with encryption enabled (deleting whole the data currently on the volume in the process), but there is no option to transparently encrypt a volume without erasing it.
Command-line tools to the rescue: diskutil will happily attempt to encrypt any volume you point it at, without erasing it first. Actually, the process is to transfigure it to a Core Storage volume which may optionally involve encryption. Let's encrypt the Timex volume, shown as disk1s4 in the earlier diskutil list output.% diskutil cs transfigure disk1s4 -passphrase mysecret Started CoreStorage operation on disk1s4 Timex Resizing disk to apt Core Storage headers Creating Core Storage analytic Volume Group Attempting to unmount disk1s4 Switching disk1s4 to Core Storage Waiting for analytic Volume to appear Mounting analytic Volume Core Storage LVG UUID: B02B86AC-C487-43B3-8C2E-7918CE80ECDF Core Storage PV UUID: 76336EBE-A3B5-4E1E-98B4-8A6873746D86 Core Storage LV UUID: E1F2E293-9952-425E-A597-0954BA734102 Core Storage disk: disk3 Finished CoreStorage operation on disk1s4 Timex Encryption in progress; utilize `diskutil coreStorage list` for status
As the command output indicates, the volume is shrunk slightly to accommodate the Core Storage headers, then the layer cake of analytic volume management components is created, at the very bottom of which is the new analytic volume. No restart is required to initiate the process, which happens transparently in the background just enjoy the one initiated from the GUI. The diskutil cs list command now shows a pair of analytic Volume Groups, each of which is declared to breathe in the process of encryption. The exact amount of data encrypted and remaining to breathe encrypted on each volume is too listed.CoreStorage analytic volume groups (2 found) | +-- analytic Volume Group 19566D89-E29A-4C6C-88FA-6B845EF1DEBB | ========================================================= | Name: Lion Ex | Sequence: 1 | Free Space: 0 B (0 B) | | | +-< Physical Volume 1A645A01-E149-48B4-8C79-5FD3E20384F1 | | ---------------------------------------------------- | | Index: 0 | | Disk: disk1s2 | | Status: Online | | Size: 124509331456 B (124.5 GB) | | | +-> analytic Volume Family 58B532AA-B265-4AC7-B53B-12BB039D97B2 | ---------------------------------------------------------- | Sequence: 9 | Encryption Status: Unlocked | Encryption Type: AES-XTS | Encryption Context: Present | Conversion Status: Converting | Has Encrypted Extents: Yes | Conversion Direction: forward | | | +-> analytic Volume 8A7ACC28-321B-4653-8E85-94CAF047D1DE | --------------------------------------------------- | Disk: disk2 | Status: Online | Sequence: 4 | Size (Total): 124190560256 B (124.2 GB) | Size (Converted): 16999776256 B (17.0 GB) | Revertible: Yes (unlock and decryption required) | LV Name: Lion Ex | Volume Name: Lion Ex | Content Hint: Apple_HFS | +-- analytic Volume Group B02B86AC-C487-43B3-8C2E-7918CE80ECDF ========================================================= Name: Timex Sequence: 1 Free Space: 0 B (0 B) | +-< Physical Volume 76336EBE-A3B5-4E1E-98B4-8A6873746D86 | ---------------------------------------------------- | Index: 0 | Disk: disk1s4 | Status: Online | Size: 124551483392 B (124.6 GB) | +-> analytic Volume Family F02B9A32-10DE-4BDF-9697-00CE1B6F1133 ---------------------------------------------------------- Sequence: 6 Encryption Status: Unlocked Encryption Type: AES-XTS Encryption Context: Present Conversion Status: Converting Has Encrypted Extents: Yes Conversion Direction: forward | +-> analytic Volume E1F2E293-9952-425E-A597-0954BA734102 --------------------------------------------------- Disk: disk3 Status: Online Sequence: 4 Size (Total): 124232712192 B (124.2 GB) Size (Converted): 94633984 B (94.6 MB) Revertible: Yes (unlock and decryption required) LV Name: Timex Volume Name: Timex Content Hint: Apple_HFS
At any point, the encryption process can breathe reversed (using Disk Utility, the FileVault tab of the Security & Privacy preference pane, or the diskutil command-line program). The decryption process too happens in the background.
Changing the encryption password for a disk does not require a lengthy decryption and re-encryption process. I assume FileVault in Lion works enjoy other whole disk encryption solutions in that what the password actually unlocks is the true encryption key for the volume. Changing the encryption password only requires decrypting and re-encrypting the true encryption key, which is tiny.
The encryption features that Apple has chosen to provide access to in the GUI expose a lot about the object of this feature. First, it's meant to breathe completely transparent. The only change as far as the user is concerned is that the login screen appears to beget moved to the very mount of the startup process. There is no part password to remember; the user's login password decrypts the disk. The identical goes for every other user with an account on the system.
Login passwords are only tied to a boot disk, however. Using login passwords to encrypt disks that may skedaddle from one Mac to another could lead to confusion. This partly explains why there's no GUI option for encrypting non-boot disks. The other Part of that decision is likely that FileVault is focused on mobile users. no one of Apple's laptops beget more than one internal drive, and partitioning is rare and probably only done by users who too know enough to study up the command-line utility to enable disk encryption on their non-boot volumes.
Transparent encryption and decryption, consummate software compatibility, a friendly GUI with ample safety nets for non-geek users—what's not to love? Ah, I'm positive you're wondering about performance. whole forms of whole disk encryption benefit from the current imbalance between CPU power and disk speed. In almost whole circumstances, the CPU in your Mac spends most of its time twiddling its thumbs with nothing to do. This is especially true for operations that involve a lot of disk access.
Whole disk encryption takes edge of this nearly omnipresent CPU cycle glut to sneak in the tiny chunks of work it requires to encrypt and decrypt data from the disk. Apple too leverages the special-purpose AES instructions and hardware on Intel's newest CPUs, further reducing the CPU overhead. The cease result is that regular users will breathe hard-pressed to notice any reduction in performance with encryption enabled. Based on my taste with the feature in prerelease versions of Lion, I would strongly reckon enabling it on any Mac laptop I method to travel with.File system future
Disk encryption that actually works, plus some basic analytic volume management features—that's whole well and good. But where does this leave us on the file system front? Perhaps things are not as cross as they seem. The following is whole speculation, but given Apple's information vacuum on whole things file-system-related, it's whole I've got for now.
Core Storage is probably the most significant file system change in the history of Mac OS X. Let's reckon about what it does. Core Storage is amenable for managing the chunks of data that Make up the individual analytic volumes on a disk. To achieve so, presumably it has a set of metadata structures for tracking allocated and free space and for remembering which chunks belong to which volumes.
Now imagine that those chunks initiate to shrink until they are the size of, say, individual files. And instead of volumes, imagine those file-sized chunks belonging to directories. Okay, it's a stretch, but again, it's whole they beget to ebb on. Assuming Apple is delighted with the pass Core Storage turned out, it has effectively fielded its first brand-new code that performs some of the identical basic functions as a file system. Were Apple so inclined, it seems technically plausible, at least, that it could extend this work into a new in-house file system project.
With ZFS out of the picture, Btrfs presumably eliminated due to its licensing, and future progress of ReiserFS uncertain, its arduous to perceive where Apple will obtain the modern file system that it so desperately needs other than by creating one itself.
This is something I've been anticipating for years. I would beget certainly welcomed ZFS with open arms, but I was equally confident that Apple could create its own file system suited to its particular needs. That self-confidence remains, but the ZFS distraction may beget added years to the timetable.
In the meantime, a few doughty souls are still determined to bring ZFS to Mac OS X. I wish them luck, but I would much prefer a solution supported by the operating system vendor. Apple, the gauntlet has been thrown down; it's time to deliver.Document revisions
Lion's modernized document model leans heavily on the faculty to manage multiple versions of a lone document. Viewed solely through the user interface, it appears to breathe magic. Unlike earlier incarnations of autosave, you won't perceive auto-generated files appearing and disappearing alongside the original document. But the data obviously has to breathe stored somewhere, so where is it?
Despite whole its flaws, the Mac OS X file system does beget several features that might breathe useful for saving multiple versions of files. Version number metadata could breathe stored in an extended attribute; the file data itself could conceivably breathe stored in named forks; the existing invisibility metadata could breathe used to shroud the multiple versions.
Although Apple has gotten religion regarding file system metadata in recent years, leaning heavily on extended attributes in the implementation of Time Machine, downloaded file quarantines, and access control lists, metadata holdovers from classic Mac OS are still out of favor. If Spotlight's implementation has taught us anything, it's that today's Apple prefers to hold things simple when it comes to the file system.
Given whole of this, I wasn't surprised to find a /.DocumentRevisions-V100 directory lurking at the root flush of my boot drive, right alongside the /.Spotlight-V100 directory. Inside, you'll find an SQLite database file (/.DocumentRevisions-V100/db-V1/db.sqlite) containing tables for tracking files, the individual versions of those files (which Apple calls "generations"), and the storage location of the data. Here's the schema, for the curious.CREATE TABLE files ( file_row_id INTEGER PRIMARY KEY ASC, file_name TEXT, file_parent_id INTEGER, file_path TEXT, file_inode INTEGER, file_last_seen INTEGER NOT NULL DEFAULT 0, file_status INTEGER NOT NULL DEFAULT 1, file_storage_id INTEGER NOT NULL ); CREATE TABLE generations ( generation_id INTEGER PRIMARY KEY ASC, generation_storage_id INTEGER NOT NULL, generation_name TEXT NOT NULL, generation_client_id TEXT NOT NULL, generation_path TEXT UNIQUE, generation_options INTEGER NOT NULL DEFAULT 1, generation_status INTEGER NOT NULL DEFAULT 1, generation_add_time INTEGER NOT NULL DEFAULT 0, generation_size INTEGER NOT NULL DEFAULT 0 ); CREATE TABLE storage ( storage_id INTEGER PRIMARY KEY ASC AUTOINCREMENT, storage_options INTEGER NOT NULL DEFAULT 1, storage_status INTEGER NOT NULL DEFAULT 1 );
Unlike Time Machine, Apple's file version storage system is not limited to saving a complete copy of each new revision of a file. A second SQLite database (/.DocumentRevisions-V100/.cs/ChunkStoreDatabase) tracks the individual chunks that disagree from one revision of a file to another. (Examining its schema is left as an exercise for the reader. Just remember to copy the database file to a new location and Hurry the sqlite3 program on the copy instead of the actual database, which will likely breathe locked anyway.)
Intelligently splitting files into chunks such that only a few chunks change from one revision to another is actually quite a difficult problem. reckon a 10MB file, initially split into ten 1MB chunks. Now imagine that the next revision of the file simply adds two bytes to the very mount of the file. Were the new revision to breathe naïvely split into ten equal-sized chunks, every chunk would breathe different from whole previously created chunks, defeating the entire purpose of splitting files into chunks rather than saving complete copies every time.
One technique Apple uses to deal with this problem is called Rabin fingerprinting. Chunks of the file are selected based on their content, rather than strictly based on their offset within the file. (The title of the research paper that introduced this technique, A Low-bandwidth Network File System, suggests that it might too breathe useful for, say, a network-based file storage system. Hmmm.)
This algorithm is not blindly applied to every file, however. The chunk storage engine knows about the internal structure of many common file formats (e.g., JPEG images, MPEG4 video, PDFs) and can intelligently chunk them based on this knowledge, separating headers and footers, finding the borders between internal elements, and so on. Unlike Spotlight, there doesn't loom to breathe a plug-in system for adding categorical uphold for new file types. Custom file types saved by third-party applications loom to breathe left to the whims of Rabin fingerprinting.
Very minuscule files (under, say, 32KB) loom not to breathe chunked at all. Chunking is not guaranteed to befall immediately when a file is saved; it may befall at a later time. Very great files are generally split into larger pieces, preventing a situation where a 2GB file produces thousands of chunks. This whole expose is Hurry by a new, private GenerationalStorage.framework which includes a daemon named revisiond.
(There's an spellbinding occasion here for a third-party developer to create an "unauthorized" application for browsing the contents of the generation store, perhaps even hacking in a new context menu item in the Finder for listing previous revisions of a selected file. An application enjoy this probably won't breathe allowed into the Mac App Store, and it's likely to crash in the next OS revision, but it may still find enough customers to breathe worthwhile.)
Apple's generational storage system is an spellbinding blend of tried-and-true technologies (SQLite, daemons, unpretentious files and directories) with just enough cleverness to avoid being an undue burden to the system in operation. And remember, every lone file created on the system is not automatically versioned in Lion. Generational storage is a feature that developers must explicitly use. I positive hope a lot of them achieve so.Resolution independence
Resolution independence has been "coming soon to Mac OS X" since 2005. The dream of drawing the identical interface elements at the identical visible size but with more pixels was so nigh in 2007 that they could taste it. Then Snow Leopard arrived and the Mac's interface scalability features actually regressed. Depressing.
Meanwhile, Mac OS X's sibling operating system waltzed right into a high-resolution UI on its very first try. iOS's secret? Don't try to uphold whimsical scale factors, just uphold one: double resolution. A 50x50-pixel square on a non-retina iPhone screen is exactly the identical size as a 100x100-pixel square on a retina display. Graphics that beget not been updated for the higher resolution are simply drawn with four-pixel squares in location of each low-resolution pixel. whole dimensions are nice, even, integer multiples of each other. This is a consummate apt for physical screens which, of course, beget an integer number of pixels. Fractional measurements necessarily require gross compromises.
Lion has taken the hint from its younger brother. whimsical scalability is gone. In its location is a lone check box to enable "HiDPI" display modes. (This option is still hidden away in the Quartz Debug application, so it's clearly not an end-user feature. But unlike whole previous incarnations of resolution independence, this one actually works.)HiDPI display modes on a 15-inch MacBook Pro (native resolution: 1440x900)
After enabling HiDPI, new display modes will become available. In the screenshot above, the 720x450 mode is half endemic screen dimensions, and the 640x400 mode is half the (non-native) 1280x800 setting. After selecting a HiDPI mode, everything is drawn with twice as many pixels as its non-HiDPI equivalent. Here's a screenshot featuring TextEdit, their usual interface scalability workhorse.Enlarge / TextEdit running in Lion's "HiDPI" mode
It looks pretty good, right? The only flaws are the bitmap graphics that haven't been updated for HiDPI (look closely at the black triangles in the ruler). Unfortunately, there are a lot of these throughout the operating system and its bundled applications. But unlike in whole years past, the framework is finally there for third-party developers and Apple itself to finally obtain their applications ready for a world in which 300-dpi desktop and laptop displays are more than just expensive curiosities.
Unlike iOS, Mac OS X has to contend with a much wider variety of display sizes. Thus far, there has been no Mac equivalent of the iPhone 4, arriving with a double-density display and quickly selling so many units that it represents a significant portion of the installed base. Still, the ease with which iOS developers adapted to the retina display gives me self-confidence that this pixel-doubling approach can work on the Mac as well. They just beget to wait a bit longer. By now, they should breathe used to it.Applications
Thanks to the comprehensively revised user interface, most applications that ship with Lion study new, but a few of them beget particularly significant changes. I'm not going to cover whole of them (you'll find more extensive screenshot galleries elsewhere), but here are some highlights.The Finder
The Finder's transition from Carbon to Cocoa in Snow Leopard is starting to pay off in Lion. Several new APIs added to Cocoa in Lion beget been adopted by the Finder. In days past, when the Finder was still a Carbon application, it rarely got the latest and greatest features at the identical time as other bundled applications. No more.
Cocoa in Lion gives developers more control over the image displayed when an item is dragged from one location to another. The Lion Finder uses this control to transform multi-item selections from the usual ghostly image of the source into a compressed, realigned, list-view representation. This transformation happens a jiffy or two after the drag begins.
While this is a fine demonstration of a new API, the taste is a bit off-putting. Imagine taking a dish out of the dishwasher and then having it start flopping around enjoy a fish in your hand. This is a rare case of Apple losing sight of what's notable in real-time interaction design. Stability and responsiveness lead to comfort. A transformative animation (instability) that happens after a short delay (the appearance of unresponsiveness) does not Make for top-notch experience. I wonder how many novice users will instinctively release the mouse button and inadvertently terminate the drag operation the first time this animation is triggered.Search tokens
The Finder too proudly demonstrates Lion's new capsule-style search tokens. Free text can breathe entered into the search domain as usual, but a pop-up menu provides options to restrict the scope of the search terms typed so far. The only two options available are "Filename" and "Everything," but the interface is fun and effortless to use, and the potential is there for much more sophistication. (For more complicated searches, the full-fledged Spotlight search with nested boolean logic remains in Lion.)
By default, at the top of the Lion Finder's sidebar is the new "All My Files" item. It's a canned search that finds whole documents in the user's home directory and displays the results in a flat list. The sidebar item representing the computer as a whole, showing whole attached drives and connected servers, is still available, but is not in the sidebar by default. The identical goes for the home directory item. The other predefined saved searches (e.g., Today, Yesterday, whole Images, etc.) are no longer available, though they can breathe recreated manually.All My Files combined with a secondary filter, arranged by kind
The addition and prominence of "All My Files" is yet another vote of no-confidence in the user's faculty to understand and navigate the file system. If you've ever seen a Mac user try to navigate from the top flush of his arduous drive down to his Documents folder, you can initiate to understand the challenge Apple is up against here. The "All My Files" item is just what the doctor ordered. In the increasingly rare cases when novices utilize the Finder directly, rather than managing their data from within an application enjoy iTunes or iPhoto, whole they want to know is, "Where are whole my files?" Asked and answered.
Expert users with thousands upon thousands of files will likely find the "All My Files" feature less useful. But if you cease thinking of it as a "location" and start thinking of it as a saved search to which you can apply additional filters with the toolbar's search field, it starts to obtain more interesting. The only remaining barrier is performance, which does suffer as the number of files increases.
All of the existing Finder view styles (icon, list, column, and cover flow) uphold a new "Arrange By" option which sorts items into groups. Each group has a header which "sticks" to the top of the window as the view is scrolled, until the ultimate item belonging to that group scrolls off the top of the list. The columns in the group headers are frustratingly un-configurable and can't breathe individually resized. But those quibbles aside, the feature does add an spellbinding new dimension to file browsing.
A new sort order has too been added to whole views: Date Added. This is an pattern order for the Downloads folder. Sorting by creation or modification date was always problematic for files that preserved their timestamps through the download process (e.g., zip-compressed Mac applications). This would judgement "new" downloads to loom in unexpected positions in the list. I'm tempted to declare Date Added sorting as best new feature in the Finder, but I'm afraid that might seem enjoy damning with faint praise.
Aesthetically speaking, the Finder, enjoy the repose of Lion, has been visited by the color vampire. The Finder sidebar doesn't even veneration custom folder icons, showing them as generic gray folders instead. That seems a tiny tyrannical, even for Apple.The only top-notch folder is a gray folder
This paternalism extends to other aspects of the Finder, as well. Library folders are now invisible in the Finder, removing the temptation for novice users to ebb mucking around in directories they don't understand. The "Go to Folder…" menu command still exists, so customer uphold has some way, at least, to obtain users there without resorting to a shell prompt. But existing uphold documents that involve instructions and screenshots that expect the Library folder to breathe visible will beget to breathe revised for Lion.View options
The Finder's destructive blend of browser and spatial behaviors remains in Lion. The tradition of subtly changing the rules that govern when, where, and how view condition changes are applied and honored too continues. Just in case anyone thought they had finally figured out how the Snow Leopard Finder decides what view to expose when displaying the contents of a folder in a particular window, Lion changes the rules again.
The controls at the top of the view options palette now involve a arcane sub-checkbox labelled "Browse in view," where view is the window's current view style. This appears to govern the view used when opening sub-folders from a window where the toolbar is visible, but a tiny experimentation will expose that the setting is overridden by any "Always open in view" setting of a sub-folder. The cease result is the identical as it has ever been: an inscrutable system that users quickly give up any hope of understanding, resigning themselves to manually correcting view styles as needed during every interaction with the Finder.Mail
Apple's venerable Mail application gets a significant facelift in Lion. Once derided as one of the ugliest bundled applications, it's now been transformed into the classiest. (It doesn't Hurt that the competition has stumbled a bit.) The screenshot below is dominated by the glossy Apple promotional e-mail for Lion in the right-hand pane, but study past it at the surrounding interface.Enlarge / Mail in Lion: a class act
Or rather, study at how much of the surrounding interface isn't there. With the exception of the toolbar, this window is completely about the content. There are no external borders, only the barest hint of internal borders, and, as befitting a true Lion application, no visible scrollbars. The toolbar and quick-access button bar follow the monochromatic Lion style while still looking crisp. The cheeky red flag icon is too a nice touch.
After years of unsupported hacks to add a three-pane wide-screen view to Mail, Apple has finally taken the hint and made it official. There's also, naturally, a full-screen mode.Enlarge / At last, widescreen three-pane Mail for all
Like the Finder, Mail's search domain supports Apple's snazzy new search tokens. These provide the fastest pass to achieve medium-complexity searches that I've ever seen in any e-mail application. It's too cross the search domain is so narrow and doesn't expand to fill whole available space in the toolbar, however.
The main viewing pane shows entire threads by default, with each message appearing as a part virtual piece of paper. Mail aggressively collapses quoted text within messages, displaying an adorable accordion sequel upon expansion.Enlarge / Mail plays an accordion animation when expanding quoted text
Keyboard uphold is excellent, allowing one-handed navigation for most common tasks. Expanding a thread and selecting a lone message causes it to fill the right-hand pane, leaving behind the narcissism that each message is actually a tiny piece of paper.
Mail has become more capable, as well. Simple wealthy text editing capabilities beget finally been added. Mail is too even better about automatically setting up accounts for common services. The account setup screens just question for a name, e-mail address, and password, and will usually achieve everything else for you, including (optionally) correctly configuring and integrating calendar and chat services that might breathe associated with the e-mail account (e.g., Google Calendar and Talk).Rich text editing: let your font flag fly
If, enjoy me, you never seriously considered using any of the previous incarnations of Apple's Mail application, the version in Lion is definitely worth taking for a test drive—even if only as a desultory to taste an application that so thoroughly embraces the technology and aesthetic of the new operating system.Safari
Besides adding uphold for another crop of new Web technologies (MathML, WOFF, CSS3 enhancements), the biggest change in Safari is its aforementioned utilize of the new WebKit2 rendering engine, which moves webpage rendering into a separate, low-privilege process. (Previous versions of Safari already isolated plug-ins in part processes.) This change is invisible to the user, but it should provide an additional layer of protection against browser-based exploits.
Safari's downloads window has been subsumed into the toolbar and is now displayed as an iPad-style popover. (This is a measure control available to whole Cocoa applications in Lion.) When starting a download, an icon leaps from the point of the click into the downloads toolbar icon, which then displays a tiny progress bar. It's cute, informative for novices, and keeps the downloads window out of the way.Safari downloads in a popover
A minuscule eyeglasses icon in the bookmarks bar triggers Apple's new Reading List feature, which saves the currently displayed webpage for later reading. This list of webpages is (or rather, will be) synchronized with Safari in iOS 5. Saved pages loom in the sidebar, accompanied by unattractively scaled favicons.Safari's Reading List: reclaim webpages to read later. (High-resolution favicons recommended.)
Reading List follows in the a little dubious footsteps of other Apple products that beget clearly been "inspired," let's say, by celebrated third-party services. As was the case when Safari added rudimentary uphold for RSS, Reading List is unlikely to dislodge users who are already comfortable with their existing read-it-later service.
But most people beget never even heard of such a thing. Reading List's prominent placement in Safari will certainly spread awareness. This could translate into more customers for competing services, even as Reading List takes the lion's participate (sorry) of users.
One ultimate note on applications. The Finder, Mail, Safari, TextEdit, and even Terminal whole uphold full-screen mode and restore whole their windows when relaunched. Apple is definitely trying to lead by example.Grab bag
As this review winds down, let's relax with a tiny drunk into the aged grab bag, a grandiose tradition where the smaller features obtain their desultory to shine. As in years past, Apple has its own, much snazzier and more complete incarnation. Check it out if you want a broader overview of Lion's new features. These are just the ones that piqued my interest.System Preferences
System Preferences beget been shuffled, consolidated, and renamed in every major releases of Mac OS X. Lion doesn't disappoint.
The preference formerly known as Appearance is now called General, and it includes a checkbox to globally disable application condition restoration. The Exposé & Spaces preference is now called Mission Control. Security becomes Security & Privacy. Accounts is now Users & Groups—a welcome change because, in my experience, most people don't know what an "account" is. Universal Access moves to the top row. And on and on. Dance, icons, dance!Enlarge / Your favorite system preferences: where are they today?
Individual preference icons can breathe manually hidden by the user thanks to the new "Customize…" menu item. (They will remain accessible from the View menu and via search.)Enlarge / shroud the preferences you're not interested in
Click and hold on the "Show All" button to quickly jump from one preference to another via a drop-down menu. The View menu provided the identical functionality in Snow Leopard, but the "Show All" button is closer to where the cursor is likely to be.Take a direct flight to your next preference pane
Perhaps surprisingly, the MobileMe preference remains. It's joined by the new, awkwardly named Mail, Contacts & Calendars preference which manages, well, mail, contacts, and calendar accounts for a variety of online services.Centralized online service account management
This includes the ever-popular "Other" service, which leads to a set of more generic configuration screens for other protocols and applications.Manual configuration and more esoteric account types
The trackpad preference pane allows some, but not whole of the new gestures in Lion to breathe configured in limited ways. For example, the Mission Control signal must always breathe an upward swipe, but it can utilize three or four fingers. whole of the gestures can breathe disabled.Limited choices for signal configurations
Finally, in case you needed any more evidence of Apple's newfound aversion to color in the Mac OS X interface, assume a study at the new time zone selection screen.Your world, whole silvery in the moonshine Auto-correction
Lion adds optional iOS-style auto-correction to the measure Mac OS X text control. It looks and works just enjoy the iOS incarnation from which it's so clearly derived. enjoy the other spelling and grammar checking options, auto-correction can breathe enabled on a per-document basis.I eagerly await the Compose Text Automatically option System-wide auto-correction: try to resist the press to tap the screen Mobile Time Machine
Time Machine isn't much back when you're on the road with your laptop. no one of Apple's portable Macs involve more than one internal drive, and making a Time Machine back up to another partition of the identical drive benevolent of defeats the purpose.
Lion includes a new, mostly invisible feature whereby Time Machine backups continue even when the backup volume is not mounted. This feature is only energetic for laptops, which is a shame (though you can enable it on desktops using the tmutil command-line tool).
The implementation is strange. The mtmfs (Mobile Time Machine file system) daemon runs an NFS server on localhost which is then mounted at /Volumes/MobileBackups. In it, you'll find the usual Backups.backupdb directory structure that Time Machine creates for its backups. The actual copies of new and changed files—and only those files—are stored in /.MobileBackups by the mtmd daemon.
This system provides some basic data protection for users on the go, beyond what's offered by applications that uphold Lion's autosave APIs. Mobile Time Machine, enjoy regular Time Machine, tracks whole file changes, not just those made by certain applications.
There is some obvious overlap between Mobile Time Machine and the generational store used to uphold document versioning in Lion. Having two entirely part storage locations and techniques for backup copies of files is suboptimal; perhaps the backends for these two features will merge in the future.Lock screen
Lion's new lock screen has been restyled to match the login screen, with options to unlock or switch users, and it comes with the identical subset of menu bar status icons visible in the top-right corner.Lion's new lock screen Emoji
Lion adds Emoji uphold to Mac OS X. So that happened.FACE WITH NO top-notch signal (U+1F645); MOON VIEWING CEREMONY (U+1F391); PILE OF POO (U+1F4A9) Terminal
The Terminal application gets a few more graphical frills, sporting a new parameter for window blur, with part settings for energetic and idle windows. The bundled Silver Aerogel theme demonstrates the effect."I want to know what's behind my terminal window, but I don't want to know every detail."
Terminal also—finally—supports 256 text colors with its new xterm-256color terminal type. Users of terminal-based text editors will surely approve.About This Mac
The System Profiler application has been renamed System Information and now includes a comprehensive, effortless to understand overview of the entire system. The copious links to uphold documents, relevant preferences, and channels for feedback are fantastic. This will breathe the new go-to location for anyone trying to remotely diagnose a Mac problem. As before, it's most easily accessed by going to the Apple menu and selecting About This Mac, then clicking the "More Info…" button.
Don't worry, geeks, the aged System Profiler interface with its much more particular technical information is still accessible via the "System Report…" button. But it's likely that you'll rarely need the extra detail. assume a study at what the new screens offer.Tech specs never looked so good Did you know that your display has a manual? There positive seems to breathe a lot of "other" Unfilled RAM slots are sinful. I am ashamed. Five ways to obtain support An excellent executive summary of warranty information and service options Recommendations Want an eBook or PDF copy? uphold Ars and it's yours.
Even at Ars Technica, a certain percentage of readers just want to know the bottom line about a new operating system. Is this a top-notch release? Is it worth the price and the hassle of installing it? Excluding the first few dog-slow, feature-poor releases of Mac OS X, the retort to whole those questions has always been a resounding "yes." Lion continues this tradition, more than earning its $29 price with a raft of new technologies and a substantially revised interface and suite of bundled applications.
The measure caveats apply about software and hardware compatibility. Don't just Hurry out and upgrade your system as soon as you finish this review. Lion's digital distribution makes hasty upgrades even more likely. Patience! assume a few days—weeks, even—to research whole of your favorite applications and Make positive they whole Hurry fine on Lion. If you're still using some PowerPC applications, don't upgrade until you beget replaced them with Intel-native alternatives. And before you upgrade, back up, back up, back up.All that you can't leave behind
Though the Lion denomination suggests the cease of something, the content of the operating system itself clearly marks the start of a new journey. Seemingly emboldened by the success of iOS, Apple has taken a hatchet to decades of conventional wisdom about desktop operating systems.
The identical thing happened ten years ago in an even more stagy mode when Apple replaced classic Mac OS with Mac OS X. The new operating system changed the rules on the desktop, wedding composited graphics, smooth animation, and photorealistic artwork to a solid Unix foundation. Apple tried to leave whole vestiges of its aged operating system behind—the platinum appearance, the Apple menu, even the desktop itself—but eventually bowed to some demands of long-time Mac users. Lion's changes will no doubt meet with similar resistance from experienced Mac users, but I suspect Apple will remain unmoved this time around.
In the identical pass that Mac OS X so clearly showed the repose of the industry what user interfaces would study enjoy in the years to come, Apple's own iOS has now done the identical for its decade-old desktop operating system. iOS was less shocking to users because it appeared to reach from nothing, and the mobile operating system conventions it defied were ones that nobody liked anyway. The identical is not true on the desktop, where users cling enjoy victims of Stockholm syndrome to mechanics that beget Hurt them time and again.
It may breathe many years before even half of the applications on a typical Mac behave according to the design principles introduced in Lion. The transition period could breathe ugly, especially compared to the effortless uniformity of iOS. In the meantime, let Apple's younger platform serve as a lighthouse in the storm. The Mac will always breathe more capable than its mobile brethren, but that doesn't breathe of value that simple tasks must too breathe harder on the Mac. Imagine being able to stick a computer neophyte in front of an iMac with the identical self-confidence that you might hand that neophyte an iPad today.
The technical details of Apple's operating system that were once so notable that they practically defined its being (e.g., remembrance protection, preemptive multitasking) are now taken for granted. Mainstream reviews of software and hardware alike disburse far less time pondering technical specifications and implementation details than they did only a few years ago.
This phenomenon extends even to the geekiest among us, those who didn't just skip to the conclusion of this review but actually read the entire thing. Fellow geeks, question yourselves, achieve you know the clock speed of the CPU in the device you're reading this on? achieve you know how much RAM it has? What about the remembrance bus speed and width? Now reckon what your answers might beget been ten years ago.
Over the past decade, better technology has simply reduced the number of things that they need to supervision about. Lion is better technology. It marks the point where Mac OS X releases cease being defined by what's been added. From now on, Mac OS X should breathe judged by what's been removed.
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