Look for a program called HDAT2. You can either download it direct and install it on a flash drive or find it on either Ultimate Boot CD or Hiren's Boot CD. HDAT2 will do a hard-scan of the sectors and remap any bad ones it finds. You'll have a visual representation of the drive's mapping which will show unused sectors, used sectors, bad sectors, and remapped sectors. Depending on the size of the hard disk, expect scan times of a couple of hours to a day or more. I use it primarily to get non-bootable systems with failing drives to boot again temporarily. It actually re-maps and rebuilds lost data. After that I can mirror the defective drive and replace with a new one.