WARNING: FATAL DIR ERROR ON VOL VOLUMENAME FAT SECTOR sss.

Occurs on:  68, 86, and 286.

Meaning:  This error is displayed if a disk read error occurs while
          reading the File Allocation Table (FAT) a volume in the file
          server.  "sss" is the sector number in which the error
          occurred.  Two copies of all FATs are kept on each system
          volume.  If a read failure occurs on the primary copy, the
          server will automatically retry the read using the secondary
          (mirrored) FAT.  This error message will display only if a FAT
          sector read failed on both copies.

Cause:  This message might occur if the server was halted suddenly by a
        hardware or power failure or by bringing down the network
        without the DOWN command.

Solution:  The file server will continue to operate as if the FAT sector
           had contained no active file entries.  This is not a fatal
           error, but it does signal significant problems in the
           directory and FAT areas, and will probably be accompanied
           with many other error messages.  The system manager should
           run VREPAIR on the volume to repair the bad sectors before
           allowing the file server to be accessed.