Sounds like a slow spindle motor? I've actually managed to accumulate a good deal of music for the short time I had my new hard drive, and that definitely did not get backed up. Of course, the kicker was I was working on an assignment that was due at 5, hit save, and suddenly I got the BSOD.
Currently, I'm running a BackTrack off a live CD with my HD removed so that I can at least do the research I need to do and check my mail without having to go down to a cluster.