I was getting this also. The smartd daemon would trigger it but that would simply time out. Trying to mount the thing hung the system up--big red switch time. The Western Digital drive would click click click when this problem was occuring which was not always but enough to be annoying.
I replaced the old 8g with a 40g faster one would was a good idea regardless, partitioned and set up the old windows from the 8g, etc. ... only to have the same thing happen. Guess what? Check the cable. JIggling that around could start and stop the problem. I replaced the cable and am hoping :-) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]