[net.micro.mac] Trashed disk

peter@entropy.UUCP (Peter Guttorp) (09/15/86)

I had recently some problems with my external drive, which upon inspection
just ended up being that the chord was not properly connected. However, in
the meantime three disks broke. When looking at them in detail, the first
three blocks are blank. It appears that the rest of the disk contains its
usual stuff. How can I recover it?