Mac OS X Snow Leopard

Mac OS X 10.6 Snow Leopard
A version of the Mac OS X operating system

Screenshot of Mac OS X Snow Leopard
Developer Apple Inc.
Source model Closed source (with open source components)
Released to
manufacturing		 August 28, 2009 (2009-08-28)
Latest release 10.6.8 v1.1 (Build 10K549) / July 25, 2011 (2011-07-25)[1]
Update method Apple Software Update
Platforms IA-32, x86-64[2]
Kernel type Hybrid (XNU)
License Commercial software license and Apple Public Source License (APSL)
Preceded by Mac OS X 10.5 Leopard
Succeeded by Mac OS X 10.7 Lion
Official website Mac OS X Snow Leopard at the Wayback Machine (archived June 6, 2011)
Support status
Unsupported as of February 25, 2014, though the last security update happened in September 2013[3] and an update to the Mac App Store on Snow Leopard was made in January 2016.[4]

Mac OS X Snow Leopard (version 10.6) is the seventh major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers.

Snow Leopard was publicly unveiled on June 8, 2009 at the Apple Worldwide Developers Conference. On August 28, 2009, it was released worldwide,[5] and was made available for purchase from Apple's website and its retail stores at the price of US$29 for a single-user license. As a result of the low price, initial sales of Snow Leopard were significantly higher than that of its predecessors.[6] The release of Snow Leopard came nearly two years after the introduction of Mac OS X Leopard, the second longest time span between successive Mac OS X releases (the time span between Tiger and Leopard was the longest).

Unlike those of previous versions of Mac OS X, the goals of Snow Leopard were improved performance, greater efficiency and the reduction of its overall memory footprint. Addition of new end-user features was not a primary consideration: its name signified its goal to be a refinement of the previous OS X version, Leopard.[7] Much of the software in Mac OS X was extensively rewritten for this release in order to take advantage fully of modern Macintosh hardware. New programming frameworks, such as OpenCL, were created, allowing software developers to use graphics cards in their applications. This is also the first Mac OS release since System 7.1.1 that does not support Macs using PowerPC processors, as Apple now intends to focus on its current line of Intel-based products.[8] As support for Rosetta was dropped in OS X Lion, Snow Leopard is the last version of Mac OS X that is able to run PowerPC-only applications.

Snow Leopard was succeeded by Mac OS X Lion (version 10.7) on July 20, 2011.[9] Since then, Apple has continued to sell Snow Leopard from its online store for the benefit of users that require Snow Leopard in order to upgrade to later versions of OS X, which have all been distributed through the Mac App Store introduced in the Snow Leopard 10.6.6 update.[10]

Snow Leopard is the last release of Mac OS X to support the 32-bit Intel Core Solo and Intel Core Duo CPUs.

System requirements

Apple states the following basic Snow Leopard system requirements are:

Additional requirements to use certain features:[11]

Snow Leopard does not support PowerPC-based Macs (e.g., Power Macs, PowerBooks, iBooks, iMacs (G3-G5), all eMacs, plus pre-February 2006 Mac minis and the Power Mac G4 Cube), although PowerPC applications are supported via Rosetta, which is now an optional install.

License

Snow Leopard is available as an upgrade for Intel-based Macintosh computers. Single-user licenses and "family pack" licenses for up to five computers are available. For qualifying Mac computers bought after June 8, 2009, Apple offered a discounted price through their "up to date" program provided that customers' orders were faxed or postmarked by December 26, 2009. The standalone retail version of Snow Leopard is marketed as being restricted to users of Mac OS X Leopard, while the recommended upgrade path from Apple for Mac OS X Tiger is through the "Mac Box Set", which includes Mac OS X Snow Leopard and the current versions of iLife and iWork.

There are three licenses available.[12] These licenses differ in their requirements for pre-installed versions of Mac OS X:

If you have purchased an Upgrade for Mac OS X Leopard license, then subject to the terms and conditions of this License, you are granted a limited non-exclusive license to install, use and run one (1) copy of the Apple Software on a single Apple-branded computer as long as that computer has a properly licensed copy of Mac OS X Leopard already installed on it.[13]
A "Family Pack Upgrade for Mac OS X Leopard" license is also mentioned as a subset of the Leopard Upgrade.
Subject to the terms and conditions of this License ... you are granted a limited non-exclusive license to install, use and run one (1) copy of the Apple Software on a single Apple-branded computer at a time.[13]

It is not entirely clear which license is offered with the retail version of Snow Leopard. As noted above, Apple's website advertised this version as an "upgrade from Mac OS X Leopard for $29" and suggest that others upgrade using the Mac Box Set, implying the stand-alone retail version to be a "Leopard Upgrade" license. On the other hand, some Apple press materials appear to indicate that this version is, in fact, the "Single Use" license:

The Snow Leopard single user license will be available for a suggested retail price of $29 (US)[14] (emphasis added)

However, even if the retail edition of Snow Leopard is in fact a "Leopard Upgrade", the company has acknowledged that there is no technical barrier in that edition preventing a direct upgrade from Mac OS X "Tiger".[15]

The Leopard Upgrade license explicitly applies to the Up-To-Date Program[16] (US$9.95) for Macs bought between June 8 and December 26, 2009[17] and the installation discs provided through this program are clearly marked as upgrades unlike either of the retail editions.

New or changed features

Mac OS X Snow Leopard is intended to be a release aimed to refine the existing feature set, expand the technological capabilities of the operating system, and improve application efficiency. Many of the changes involve how the system works in the background and are not intended to be seen by the user. For example, the Finder application was completely rewritten in the Cocoa application programming interface. Despite significant changes in the software, users will experience almost no changes in the user interface. Snow Leopard includes the following changes:

The 10.6.6 update introduced support for the Mac App Store, Apple's digital distribution platform for OS X applications.[23]

Refinements to the user interface

While the Finder was completely rewritten in Cocoa, it did not receive a major user interface overhaul. Instead, the interface has been modified in several areas to promote ease of use. These changes include:

New wallpapers

As with most upgrades of Mac OS X, new wallpapers are available. There are new wallpapers in the Nature (two of which are of snow leopards), Plants and Black and White sub-folders under the Apple folder. Furthermore, there are new Apple wallpaper sub-folders with multiple wallpapers:

New solid colors can be used as wallpapers as well. There is a new blue and gray, as well as a solid kelp which serves as the "green wallpaper." The default "space nebula" wallpaper has been updated as well.

Dropped features

Developer technologies

64-bit architecture

Mac OS X Tiger added limited support for 64-bit applications on machines with 64-bit processors; Leopard extended the support for 64-bit applications to include applications using most of Mac OS X's libraries and frameworks.

In Snow Leopard, most built-in applications have been rebuilt to use the 64-bit x86-64 architecture (excluding iTunes, Front Row, Grapher and DVD Player applications).[32] They will run in 32-bit mode on machines with 32-bit processors, and in 64-bit mode on machines with 64-bit processors.

In addition, the Mac OS X kernel has been rebuilt to run in 64-bit mode on some machines. On those machines, Snow Leopard supports up to 16 terabytes of RAM. Newer Xserve and Mac Pro machines will run a 64-bit kernel by default; newer iMac and MacBook Pro machines can run a 64-bit kernel, but will not do so by default.[33] Users wishing to use the 64-bit kernel on those machines must hold down the numbers 6 and 4 on the keyboard while booting to get the 64-bit kernel to load.[34][35] A change to the com.apple.Boot.plist will also enable users with compatible computers to permanently boot into 64-bit for those wishing to do so.

Stuart Harris, software product marketing manager at Apple Australia, said, "For the most part, everything that they experience on the Mac, from the 64-bit point of view, the applications, the operating system, is all going to be 64-bit, but that at this stage there were very few things, such as device drivers, that required 64-bit mode at the kernel level".[35]

With Mac OS X Snow Leopard only the following Apple computers run or are capable of running the 64-bit kernel:[36]

Product Model identifier K64 status on client version K64 status on server version
Xserve early 2008 and later Xserve2,1 and higher Capable Default
Mac Pro early 2008 MacPro3,1 Capable Default
Mac Pro early 2009 MacPro4,1 Capable Default
Mac Pro mid-2010 MacPro5,1 Default Default
MacBook Pro early 2008 MacBookPro4,1 Capable Capable
MacBook Pro late 2008 MacBookPro4,1 and 5,1 Capable Capable
MacBook Pro early 2009 MacBookPro5,2 Capable Capable
MacBook Pro mid-2009 MacBookPro5,3 and 5,4 and 5,5 Capable Capable
MacBook Pro mid-2010 MacBookPro6,1 and 6,2 and 7,1 Capable Capable
MacBook Pro early 2011 MacBookPro8,1 and 8,2 and 8,3 Default Default
iMac early 2008 and later iMac8,1 and higher Capable Capable
Mac Mini mid-2010 Macmini4,1 Capable Default

^* Amit Singh has reported that the early 2009 Mac Mini and MacBook may be capable of running the 64-bit kernel; however, Apple has set these models to boot into the 32-bit kernel. With some tweaking, the Unibody MacBook can be set to boot the 64-bit kernel.[37]

Grand Central Dispatch

Grand Central Dispatch uses the multiple processor cores now in every new Macintosh for more efficient performance. Due to the technical difficulties traditionally involved in making applications optimized for multicore CPUs, the majority of computer applications do not effectively use multiple processor cores.[38] As a result, processing power often goes unused. Grand Central Dispatch includes APIs to help programmers efficiently use these cores for parallel programming.

Grand Central Dispatch shifts thread handling focus to itself rather than leaving it to specific applications to distribute jobs evenly across cores and clears up unused memory created by inactive or old threads to achieve maximum performance. Apple is also releasing APIs for Grand Central Dispatch for developers to use in their applications and also to analyze specific blocks of code running on Grand Central Dispatch.[39]

A new C and Objective-C language feature named "Blocks" facilitates creation of code that will easily optimize to take advantage of Grand Central Dispatch.[40][41][42]

OpenCL

OpenCL (Open Computing Language) addresses the power of graphics processing units (GPUs) to leverage them in any application, and not just for graphics-intensive applications like 3D games. OpenCL automatically optimizes for the kind of graphics processor in the Mac, adjusting itself to the available processing power. OpenCL provides consistent numeric precision and accuracy, fixing a problem that has hampered GPU-based programming in the past.[43]

OpenCL includes a C-based programming language with a structure that is already familiar to Mac OS X programmers, who can use Xcode developer tools to adapt their programs to work with OpenCL. Only the most process intensive parts of the application need to be written in OpenCL C without affecting the rest of the code. OpenCL is an open standard that has been supported by AMD, Intel, and Nvidia; it is maintained by Khronos Group.[20]

It serves a similar purpose to Nvidia's C for CUDA and Microsoft's Direct3D 11 compute shaders.

It only works with the following Mac GPUs: NVIDIA GeForce 320M, GT 330M, 9400M, 9600M GT, 8600M GT, GT 120, GT 130, GTX 285, 8800 GT, 8800 GS, Quadro FX 4800, FX 5600 and ATI Radeon HD 4670, HD 4850, HD 4870, HD 5670, HD 5750, HD 5770, HD 5870, HD 6490M, HD 6750M, HD 6770M, HD 6970M.[11] If the system does not possess one of these compatible GPUs, OpenCL code will instead execute on the system's CPU.[44]

CUPS

CUPS (the printing system used in many Unix-like operating systems) has been updated to version 1.4 which provides improved driver, networking, and Kerberos support along with performance improvements. CUPS 1.4 is also the first implementation of the Internet Printing Protocol version 2.1.[45]

Power management

Power management has been improved, with implementation of a new wake on demand feature supported on more recent Macintosh hardware.[46] Wake on demand takes advantage of the sleep proxy service implemented in AirPort and Time Capsule routers,[47] so that the computer can sleep while the router responds to mDNS queries. Should the request require the host computer to wake up, the router sends the necessary special wake-up-packet[48] to the sleeping computer.

Security

Apple strengthened Mac OS X by implementing stack protection, and sandboxing more Mac OS X components such as the H.264 decoder in QuickTime and browser plug-ins as a separate process in Safari.[49] An anti-malware feature was also added to the system that alerts the user if malware is detected.[50] Mac OS X 10.6.8 added regular malware definition updates.[51]

Computer security researcher Charlie Miller claims that OS X Snow Leopard is more vulnerable to attack than Microsoft Windows for lacking full address space layout randomization (ASLR) since Mac OS X Leopard,[52] a technology that Microsoft started implementing in Windows Vista.[53]

The Safari web browser has received updates to version 6.0 in Lion and Mountain Lion, but not in Snow Leopard.[54]

Compatibility

Snow Leopard breaks compatibility with several older versions of some applications, such as Parallels Desktop 3.0, versions of Aperture before 2.1.1, and versions of Keynote before 2.0.2, among other software.[55] Apple has also published a list of applications with known compatibility issues with Snow Leopard.[56]

Printer and scanner drivers used by previous versions of Mac OS X are not compatible with Snow Leopard and will be replaced during Snow Leopard installation. Since the initial release of Snow Leopard many manufacturers have provided compatible drivers that are available via Software Update.[57] If a native driver is not available Snow Leopard also includes CUPS and Gutenprint open source drivers that may provide limited functionality.

10.6.0 introduced a bug that frequently prevented DNS queries from returning IPv6 addresses.[58][59][60] This was resolved in 10.6.8.[61]

Reception

At the WWDC in 2009, Apple stated that Snow Leopard features no new major visual changes.[62] Instead, the release focuses on refining the operating system to enable better performance.[62]

OSNews reported that Mac OS X Snow Leopard was well received by critics.[63][64]

Engadget reviewed Snow Leopard and pointed out that the price of Snow Leopard dropped from the $129 Apple charged for previous versions of Mac OS X to $29. Engadget's opinion was that this could be largely because most users would not see a noticeable change in the look and feel of the system.[65] However, most reviews commented on the large improvement in speed of the native Mac OS X applications Finder, iCal, Mail, etc.[65]

CNET editors gave it 4 stars out of 5, stating "Intel Mac users will like Snow Leopard's smartly designed interface enhancements, and its Exchange support is a must-have (especially with Outlook for Mac on the way). With a ton of technological improvements, Snow Leopard is worth the $29 upgrade fee."[66]

On October 21, 2009, SFGate blogger Yobie Benjamin wrote that the "MacBook Pro that came preloaded with Snow Leopard kicks butt and is a screaming fast machine", but "when I tried to upgrade one of my 'older' MacBooks, it was a fricking disaster from hell". Apart from upgrading, Benjamin also tried a clean install. But he complained of slowness even after his clean install. He wrote, "I ended up downgrading back to OSX 10.5.8" then he concluded by writing, "I might try to do it again but it won't be till Apple releases at least 2 major fix updates. If you want to roll the dice and try, go ahead... your upgrade might work, however, random installs not working is not good for me. Lesson learned --- I'll wait."[67]

The single-user upgrade and Family Pack units of Snow Leopard ranked 1 and 2 respectively on Amazon.com's software bestseller charts when Apple announced it would release it within the week.[68]

Testmac.com highlighted other unexpected improvements including the release of a new version of Boot Camp, version 3.0, a cleaner, popup software update process and screen and video recording in the new QuickTime Player.[69]

The BBC reported that a bug in Mac OS X versions 10.6.0 and 10.6.1 which, in rare cases, caused loss of user account data after use of a previously existing guest account by users who had upgraded from a previous version of Mac OS X, received wide publicity.[70] The bug was fixed as of version 10.6.2.[71]

Release history

Former Apple CEO Steve Jobs announced Snow Leopard at WWDC on June 9, 2008,[72] and it was privately demonstrated to developers by Senior Vice President of Software Engineering Bertrand Serlet. On Monday, May 11, 2009, after build 10A354, Apple issued a code freeze on Snow Leopard's APIs.[73] The first public demonstration was given at WWDC 2009 by Serlet and Vice President of Mac OS Engineering, Craig Federighi.[8][74]

Version Build[75] Date OS name Notes Download
10.6 10A432 August 28, 2009 Darwin 10.0 Original retail DVD release N/A
10A433 Server edition; Original retail DVD release
10.6.1 10B504 September 10, 2009 Darwin 10.1 About the Mac OS X v10.6.1 Update Mac OS X v10.6.1 Update
10.6.2 10C540 November 9, 2009 Darwin 10.2 About the Mac OS X v10.6.2 Update Mac OS X v10.6.2 Update
10.6.3 10D573 March 29, 2010 Darwin 10.3 About the Mac OS X v10.6.3 Update Mac OS X v10.6.3 Update
10D575 April 1, 2010 Second retail DVD release N/A
10D578 April 13, 2010 About the Mac OS X v10.6.3 Update; v1.1 Mac OS X v10.6.3 v1.1 Update (Combo)
10.6.4 10F569 June 15, 2010 Darwin 10.4 About the Mac OS X v10.6.4 Update Mac OS X v10.6.4 Update (Combo)
10.6.5 10H574 November 10, 2010 Darwin 10.5 About the Mac OS X v10.6.5 Update Mac OS X v10.6.5 Update (Combo)
10.6.6 10J567 January 6, 2011 Darwin 10.6 About the Mac OS X v10.6.6 Update Mac OS X v10.6.6 Update (Combo)
10.6.7 10J869 March 21, 2011 Darwin 10.7 About the Mac OS X v10.6.7 Update Mac OS X v10.6.7 Update (Combo)
10J3250 March 21, 2011 For the early 2011 Macbook Pro Mac OS X v10.6.7 Update for early 2011 MacBook Pro
10J4138 May 4, 2011 For the early 2011 Macbook Pro MacBook Pro Software Update 1.4
10.6.8 10K540 June 23, 2011 Darwin 10.8 About the Mac OS X v10.6.8 Update Mac OS X v10.6.8 Update (Combo)
10K549 July 25, 2011 About the Mac OS X v10.6.8 Update; v1.1 Mac OS X v10.6.8 v1.1 Update (Combo)

Mac OS X Server includes these features and other server-related features. Apple initially stated that Server would include ZFS support, but mention of this feature later disappeared from Apple's website and it was not included in the final release due to licensing issues.[76]

On January 27, 2016, Apple released an update for the Mac App Store on Mac OS X 10.6. The update is titled "Mac App Store Update for OS X Snow Leopard". It's a 3.5MB download for the Mac App Store.[77]

See also

References

  1. ↑ http://support.apple.com/kb/DL1400
  2. ↑ "Mac OS X v10.6 Snow Leopard — Installation and Setup Guide" (PDF). Apple Inc. September 2009. Retrieved February 8, 2011.
  3. ↑ http://www.computerworld.com/s/article/9246609/Apple_retires_Snow_Leopard_from_support_leaves_1_in_5_Macs_vulnerable_to_attacks
  4. ↑ http://arstechnica.com/apple/2016/01/apple-updates-snow-leopard-so-you-can-continue-to-upgrade-from-snow-leopard/
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  6. ↑ "Snow Leopard Leaps Out of the Gate: Sales for Latest Apple OS Far Exceed Prior Launches, According to NPD". NPD Group. September 17, 2009. Retrieved May 7, 2010.
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  13. 1 2 Apple Inc. "Software license agreement for Mac OS X: Single Use, Family Pack and Leopard Upgrade Licenses for use on Apple-branded Systems" (PDF). Apple Inc. Retrieved February 1, 2011.
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  17. ↑ In the Up-To-Date Program terms and conditions, the 'upgrade' language is used: This program entitles the purchaser of a qualifying product purchased between June 8, 2009, and December 26, 2009, to upgrade to Mac OS X v10.6 Snow Leopard. "Mac OS X Snow Leopard Up-to-Date Program". Apple Inc. Retrieved September 4, 2009.
  18. 1 2 "Mac OS X 10.6 Refinements". Apple Inc. Archived from the original on June 11, 2009.
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  33. ↑ "Mac OS X Server v10.6: Macs that use the 64-bit kernel". Apple. Retrieved September 6, 2009.
  34. ↑ "Mac OS X Server v10.6: Starting up with the 32-bit or 64-bit kernel". Apple. Retrieved September 6, 2009.
  35. 1 2 "64-bit Snow Leopard defaults to 32-bit kernel". CNET. Retrieved September 6, 2009.
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  37. ↑ "Is Your Machine Good Enough for Snow Leopard K64?". Mac OS X Internals: The Blog. Retrieved February 8, 2011.
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  39. ↑ Markoff, John (June 10, 2008). "Apple in Parallel: Turning the PC World Upside Down?". The New York Times. Retrieved February 8, 2011.
  40. ↑ Lattner, Chris (August 27, 2008). ""Blocks" in Clang (aka closures)".
  41. ↑ Quatermain, Alan (September 1, 2008). "Comment on Article: Cocoa for Scientists (Part XXVII): Getting Closure with Objective-C". MacResearch.
  42. ↑ "Grand Central Dispatch a better way to do multicore" (PDF). Apple Inc. 2009.
  43. ↑ OpenCL Taking the graphics processor beyond graphics (PDF), Apple Inc., 2009
  44. ↑ , John Siracusa's review of Snow Leopard for Ars Technica.
  45. ↑ Sweet, Michael (January 9, 2009). "IPP/2.1 support now in CUPS 1.4svn!". Bits (Printer Working Group). Retrieved June 5, 2009.
  46. ↑ Glenn Fleishman (August 28, 2009). "Wake on Demand lets Snow Leopard sleep with one eye open". Macworld.com. Retrieved September 15, 2009. How it works", "Energy Saver preference pane
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  48. ↑ Note: The networking industry nomenclature for a wake-up-packet is Magic Packet
  49. ↑ "Peering Inside Snow Leopard Security", TidBITS Safe Computing, August 27, 2009
  50. ↑ Apple Confirms Anti-Malware Added to 'Snow Leopard'., August 27, 2009
  51. ↑ Apple releases Mac OS X update to catch MAC Defender malware, May 31, 2011
  52. ↑ "Apple's Snow Leopard Is Less Secure Than Windows, But Safer," Wired, September 2, 2009
  53. ↑ "Snow Leopard security - The good, the bad and the missing", The Register, August 29, 2009
  54. ↑ Where are the Safari security updates for Windows and Snow Leopard? Users left exposed, Sophos Naked Security blog, July 30, 2012
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  57. ↑ "Mac OS X v10.6: Printer and scanner software". Support.apple.com. Retrieved June 21, 2011.
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  61. ↑ "10.6.8 seems better". Ipv6-dev (Mailing list) (Apple Inc.). June 24, 2011. Retrieved April 22, 2013.
  62. 1 2 John Siracusa (August 31, 2009). "Mac OS X 10.6 Snow Leopard: the Ars Technica review". Ars Technica.
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  64. ↑ "Review roundup: Apple's Snow Leopard sports subtle improvements". Appleinsider.com. August 27, 2009. Retrieved June 21, 2011.
  65. 1 2 "Review From". Engadget.com. Retrieved June 21, 2011.
  66. ↑ "Snow Leopard Review and Rating from CNET". Reviews.cnet.com. Retrieved June 21, 2011.
  67. ↑ Benjamin, Yobie (October 21, 2009). "Windows 7 is darn good; Apple OS X Snow Leopard is a upgrade dog". Sfgate.com. Retrieved June 21, 2011.
  68. ↑ Gregg Keizer (August 24, 2009). "Snow Leopard Pre-Order sales". Computerworld.com. Retrieved June 21, 2011.
  69. ↑ "Review From TestMac.com". Testmac.net. June 26, 2008. Retrieved June 21, 2011.
  70. ↑ "Data losses in Snow Leopard bug". BBC News. October 13, 2009.
  71. ↑ "Apple releases Mac OS X 10.6.2 with guest account bug fix". Appleinsider.com. November 9, 2009. Retrieved June 21, 2011.
  72. ↑ "Apple Previews Mac OS X Snow Leopard to Developers" (Press release). Apple Inc. June 9, 2008. Retrieved August 16, 2012.
  73. ↑ Muchmore, Michael (May 15, 2009). "Analyst's View: What to Expect in Apple's Snow Leopard". PC Magazine. Retrieved May 26, 2009.
  74. ↑ Apple Inc. (2009). "Apple - QuickTime - Apple WWDC Keynote Address". Apple Inc. Retrieved December 29, 2010.
  75. ↑ "Mac OS X: About This Mac "build" information". Apple Inc. April 14, 2010. Retrieved April 26, 2010.
  76. ↑ Chris Foresman (October 26, 2009). "Apple abandons ZFS on Mac OS X project over licensing issues". Ars Technica. Retrieved November 9, 2009.
  77. ↑ Hall, Zac. "Apple releases OS X 10.11.4 public beta 2 + rare update for OS X 10.6 Snow Leopard". 9to5Mac. Retrieved 2016-01-28.

External links

Preceded by
OS X 10.5		 OS X 10.6
2009 		Succeeded by
OS X 10.7
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