iMac SuperDrive Firmware Update

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Apple has released iMac SuperDrive Firmware Update 1.0 via the Software Update utility. The update addresses an incompatibility with 4x DVD-R and 2x DVD-RW media when used with the internal SuperDrive found in the 15" flat-panel iMacs, and also fixes a problem with ejecting audio CDs that are copy-protected or have mastering errors.

http://www.apple.com/hardware/superdrive/