Corrupted Toppy Disks
A Toppy uses a propriety file system (FAT24). When the file system is corrupted, the bulk of the files on the disk are not damaged, they just can't be accessed because the file index system has been destroyed.
As far as I know, there are only two programs that can recover the disk. These are TopfHDRW/Doctor (by Aldarin) and my ToppyDiskMedic (TDM) program. I wrote TDM because TopfHDRW made a rubbish job at repairing my disk (it works OK on some disk errors).
Basically, you send the disk to me (and pay postage both ways) and I do the recovery.