http://www.apple.com/hardware/superdrive/ Apple has posted the Power Mac G4 SuperDrive Update for Mac OS X, which addresses an incompatibility with 4x DVD-R and 2x DVD-RW media when used with the internal SuperDrive found in affected Power Mac G4s that were released prior to August. Apple recently posted the update for the iMac superdrives. -To verify if your SuperDrive-equipped Power Mac G4 or iMac needs the update, click the Devices and Volumes tab of the Apple System Profiler application, and then click the CD-RW/DVD-R disclosure triangle to see information about the device. If the Vendor Identification field names a manufacturer other than Pioneer, you dont need the update. If the Vendor Identification field names Pioneer as the vendor, you may need the update. For drives with the Product Identification DVR-104, no update is required if the Device Revision number is A227 or higher. For drives with the product Product Identification DVR-103, no update is required if the Device Revision number is 1.90 or higher.