On the heels of the recent iMac refresh (see “New iMac Gains Thunderbolt, FaceTime HD, and Quad-Core CPUs,” 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 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, 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)
Single Time Machine Backups
Tired of Time Machine running all the time? You can turn it off in the Time Machine preference pane, but still initiate a single backup by choosing Back Up Now from Time Machine's menu bar icon. Of course, your backup is much less likely to be up to date, but Time Machine won't be taking any resources while you're trying to work.
Mac OS X 10.6.7 for iMac (Early 2011) and iMac EFI Update 1.6
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I just received my new 21.5" quad i7 iMac and was applying all the updates during setup. The iMac shipped with 10.6.6. A bunch of updates are available in Software Update including 10.6.7. Haven't tried anything from there yet. Instead I downloaded the 10.6.7 combo updater and it says that my system drive doesn't meet the requirements. Could it be the updater doesn't recognize the new iMacs yet?
With a new machine, I'd let Software Update do the work rather than rely on the combo updater, since it's unclear where in the timeline it was released.