This article originally appeared in TidBITS on 2011-05-06 at 3:38 p.m.
The permanent URL for this article is: http://tidbits.com/article/12159
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Mac OS X 10.6.7 for iMac (Early 2011) and iMac EFI Update 1.6

by Marco Tabini

On the heels of the recent iMac refresh (see “New iMac Gains Thunderbolt, FaceTime HD, and Quad-Core CPUs [1],” 3 May 2011), Apple has released a couple of iMac-specific updates that address stability-related issues with several apps and interfaces, with a particular focus on Thunderbolt. Mac OS X 10.6.7 Update 1.0 for iMac (Early 2011) 1.0 [2] introduces fixes that improve the reliability of Back to My Mac, App Store, and FaceTime, and corrects issues in Windows file sharing, graphics and video display, and the new Thunderbolt interface. The latter is also the main target of the iMac EFI Update 1.6, whose release notes mention no changes beyond Thunderbolt. But according to Other World Computing [4], the update also unlocks the full 6 Gbps SATA 3.0 capabilities of the two internal drive bays, though the optical drive bay remains at 3 Gbps. As always with firmware updates, do not disturb or power down your iMac while installing, since it could leave the Mac in a non-functional state. Both updates can be downloaded and installed via Software Update, or through their individual pages on Apple’s Web site. (Free, 382.56 MB and 6.1 MB respectively)

[1]: http://tidbits.com/article/12150
[2]: http://support.apple.com/kb/DL1383
[3]: http://support.apple.com/kb/DL1380
[4]: http://blog.macsales.com/10050-firmware-update-enables-6gbs-in-2011-imacs