mbadblocks

Check and repair floppy disk problems, test an MS-DOS disk, and mark bad blocks in the FAT

syntax
      mbadblocks drive:

description
       All unused bad blocks are marked as such in the FAT.
       This  is intended  to  be  used  right  after  mformat.
       It is not intended to salvage bad disks.

bugs
       Mbadblocks should (but doesn't yet :-( ) also try to
       salvage bad blocks which are in use by reading them 
       repeatedly, and then mark them bad.

"All things can corrupt perverted minds" - Ovid (tristia)

Related commands:

mtools - Manipulate MS-DOS files
cksum - Print CRC checksum and byte counts

Equivalent Windows NT commands:

CHKDSK - Check Disk - check and repair disk problems