Apple rolled out SuperDrive Firmware Update 3.0 on Monday. The update addressed iMac and Mac mini optical drive noise on startup and wake from sleep.
The update requires iMac EFI Firmware Update 1.4 or Mac mini Firmware Update 1.2, and Mac OS X 10.5.7 or later.
The updater adds and application called SuperDrive Update.app to /Applications/Utilities. The updater applications should launch automatically once the download completes to begin the firmware update process.
SuperDrive Firmware Update 3.0 is available via Apple's Software Update application or as a downloadable installer at the Apple Support Web site.