So I just made some space on my HD with games and ran Defraggler: 36 fragments, 11 fragmented files (2,7GB). Usually this would be a quick job, but it's going very slowly and Defraggler shows ETA >1 day. Something's not right here. I suspect the HD may be faulty, but I ran the windows HD check and it found no errors. How can I find out for sure what's the problem?