This article originally appeared in TidBITS on 2011-04-25 at 11:06 p.m.
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iMac Hard Drive Firmware Update 1.0

by Adam C. Engst

If you have a mid-2010 iMac, Apple has just released the iMac Hard Drive Firmware Update 1.0 [1] to resolve a problem that might prevent your iMac from booting properly. Although there’s no way to know if you really need this update or not, the inability to boot could make installing this update in the future significantly more difficult, so I’d recommend doing it now, after making sure you have a current backup. (Free, 767 KB)