From Apple: MacBook Pro Hard Drive Firmware Update 2.0 reduces certain infrequent noises made by 7200-rpm drives. These drives shipped with the June 2009 MacBook Pro. To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/Hard Drive Update.app). The updater will launch automatically when the installation is complete. New Hard Drive firmware will be: 0007APM2.
read more +