Hard drives are hard to repair, once my 40GB PC Drive died and just to try, i put on rubber gloves, and tore the drive down, and rebuilt it handling all of the parts carefully, and put it back together. unfortunately, it never worked, and i bought a new drive, one thing to try is putting it in the freezer for a few hours, this is a temporary fix, and you shouldn't put the whole ipod in of course! you may be able to recover data though.