New firmware on the SuperDrive which addresses an incompatibility with 4x DVD-R and 2x DVD-RW media, and the 2x SuperDrive in iMac. You must perform this update If you intend to use 4x DVD-R or 2x DVD-RW media in your iMac. This update also enables you to eject audio CDs that are copy-protected or have mastering errors. This update is required only for iMac models with 15" flat panel displays and an internal SuperDrive.
Keep Drive Spinning ensures that a connected drive never goes into low-power mode.
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