Man this is the problem I'm having exactly. And I also have 2 WD 200GB drives that are doing it. I have the latest Bios for the Motherboard and the Latest Hard Drive drivers and windows updates. I've Checked both drives repeatedly and they check out fine. Memory has been checked and it's fine. Bought new motherboard, power supply, video card, cables, and case, still same problem. No other drives (80GB or 100GB) have this problem, just the big ones. Sure could use some help here if anyone has any. I found this thread doing google search. This seems like a great forum. -- Rick I did find some info that might have something to do with this about folders with frequent file adding and deleting having this problem - but this is an older Windows NT post - not sure how this works with XP.