The drive cannot find the sector requested.
The disk or floppy disk may be damaged, unformatted, or not compatible with the operating system.
Retry the command after you do one of the following: (1) make sure the disk is properly inserted; (2) use the Chkdsk utility to check that the disk is not damaged; (3) format the disk or floppy disk for the appropriate file system (realize that when you format a disk, any information that was previously on the disk will be erased); or (4) check to make sure you do not have a high density floppy disk in a low density floppy drive.