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Mac OS X 10.6.8 Released Enabling Additional SSD TRIM Support (Updated)

On Thursday, Apple released the eighth update to Mac OS X Snow Leopard in the form of Mac OS X 10.6.8. Apple lists a small number of changes. This is very likely the last update to Snow Leopard before Mac OS X Lion comes out in July. In addition, this update enables SSD TRIM support for machines other than the 2011 MacBook Pro models.

The following changes are listed for Mac OS X 10.6.8.

  • Enhance the Mac App Store to get your Mac ready to upgrade to Mac OS X Lion
  • Resolve an issue that may cause Preview to unexpectedly quit
  • Improve support for IPv6
  • Improve VPN reliability
  • Identify and remove known variants of Mac Defender

In addition, an unreported change is the addition of TRIM support for SSD drives. As we reported in March with the release of Mac OS X 10.6.7, TRIM support was not enabled for any SSD drives besides those supported with the custom 10.6.6 build for the 2011 MacBook Pro models.

As shown from the following screenshot, the 64GB SSD on a 2010 MacBook Air model now shows “TRIM Support: Yes.”

The screenshot right after Mac OS X 10.6.7 was released showed “TRIM Support: No.”

This is a great development for Mac OS X Snow Leopard and comes as something of a surprise. The consensus seemed to be that Mac OS X Lion would provide SSD TRIM support across the board but Snow Leopard was unlikely to receive the update for systems other than the 2011 MacBook Pro models.

We are all looking forward to the release of Mac OS X 10.7 Lion and this 10.6.8 update seems to be the final step before its release. The Mac OS X 10.6.8 Combo Update is available from Apple’s Support Downloads site. The update can also be downloaded through Software Update.

Update: It has been confirmed that TRIM support is only enabled on Apple-provided SSDs. In tests with two different third-party SSDs, TRIM was not enabled.

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