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      STACKER NOTE                                         STACKER NOTE
                   REBOOT DURING SDEFRAG, WRITE PROTECTED
                    (Applies to all versions of Stacker)
      STAC FAX  31707 (12-07-1993)
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      BACKGROUND
      
      When Stacker mounts a Stacker drive it verifies the STACVOL file
      containing the compressed data.  If the Stacker Optimizer
      (SDEFRAG) was interrupted during the "Optimizing files..." stage
      of optimization, Stacker pauses the normal startup of your
      computer with this message until the problem is corrected:
      
        E: = C:STACVOL.DSK Reboot during SDEFRAG detected (Write
             protected)
        Press any key to continue...
      
      NOTE:  The Stacker utility CHECK is referenced throughout this
      document.  If you use a version of Stacker prior to 3.0, use
      SCHECK instead of CHECK.
      
      SOLUTION
      
       1. Type SDEFRAG drive:  where drive is the Stacker drive.
          SDEFRAG repairs the drive and restarts your computer.
      
       2. Run CHECK /F on the Stacker drive before running the Stacker
          Optimizer again.
           
      UNABLE TO REPAIR FATS, #139     /     UNABLE TO REPAIR FATS, #86
      
      If SDEFRAG is not able to repair the Stacker drive, you'll get
      one of these messages.  It means that both copies of the File
      Allocation Table (FAT) have been corrupted.  Some data is already
      lost, but this procedure will save the remaining data on your
      disk.
      
       1. Switch to the Stacker drive and type CHECK /=A /F and press
          <Enter>.
      
       2. When CHECK offers to repair the drive, let it.
      
       3. When CHECK offers to delete files, respond no.
      
       4. Restart you computer and run CHECK /F again.  Let it delete
          any files still reported as damaged.  Then use your most
          recent backup to restore missing files.
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      Copyright 1993 Stac Electronics