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. This version is the first release on CNET Download.com.