Hard drive click + beep
http://www.youtube.com/watch?v=_gOhgaIMpPI
and mine too appears randomly approximately 15-20 times per day. It does not appear to matter if the computer is under light or heavy use and it seems truly random when it occurs. Another user on youtube has also experienced this with their new MBP 15 and sent me a wav file with the same sound mine is making. So far, his experience is that it does NOT occur under bootcamp. This leads me to believe that it is something specific to OSX. Turning off the "put hard drive to sleep when possible" does not seem to make any difference. I have not personally tested bootcamp on my machine to confirm that mine is the same, but the original poster of the youtube video linked above also seems to think it is OSX specific.
Any clues? Should I try to get apple to swap the HD for a new one? Any help is greatly appreciated.
MacBook Pro 15 Mid 2009, Mac OS X (10.5.7), Hard Drive ST9500420ASG