Apple released several firmware updates during the night:
SuperDrive Firmware Update 3.0
This update will eliminate the noise made by the optical disk drive during system startup and wake from sleep on your Mac.
MacBook EFI Firmware Update 1.4
This update eliminates the noise made by the optical disk drive during system startup and wake from sleep on MacBook computers.
AirPort Client Update 2009-002
This update is recommended for all Macintosh computers running Mac OS X Snow Leopard 10.6.2.
MacBook Pro EFI Firmware Update 1.8
This update eliminates the noise made by the optical disk drive during system startup and wake from sleep on MacBook Pro computers
