When other means (Fedit+, Disk First Aid) have failed to repair a disk that's
gone bad, try this procedure:
1. Copy the disk with the sector copy mode of Copy II. When Copy II Mac
encounters a bad block, it zeros that block on the destination disk. This
gets rid of any unreadable blocks.
2. Run Disk First Aid v1.2 with "Repair Automatically" (Options menu) checked.
When a disk goes bad, don't be too quick to give it up for lost. There are
several ways to recover data from bad disks. Oh, yes -- back up often.