Source:  FILESYS.NLM

Explanation:  A File Allocation Table (FAT) is an index to one or more disk allocation blocks in which a file is located.

Action:  Run VREPAIR and restart the system.

Warning: If you delete the volume, all data will be destroyed. You will have to restore the data from a backup.

If the problem persists, make sure a volume backup exists. Delete the volume, re-create it, and restore the data from the backup.