My hardrive shuts itself down once in a while. It seems to do it periodically with no common preceding action/cause. Usually it will just come back up on it's own after a few seconds, but sometimes it has a disk error when it comes back up. I've looked into the box and don't see any reason why it would be overheating. I've run scandisk and defrag which both have not indicated any bad sectors on the platters. It's a 2 year old 6.4 gig Maxtor that came with the system. Is this a sign that it's dying, or is there some other possible cause?