I believe I too am now having this problem. I had a bug and removed it. then a few weeks later, I lost my hard drive. Chkdsk not not help your problems did not help. So I got out a older hard drive and plugged into my laptop to clean it up was working fine, within a few day it too failed. Only would show the drive letter. Today my external drive died. Only showing the letter. running now chkdsk G: /x /b showing 4 clusters bad also showing index, and usn journal with the problems. Believe I seen this before the other 2 failed. I used you tweek program on 2 of the 3 disk, and if I remember there was something about turning off index to speed up the sys. Could this be killing my drives? using vista.