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      STACKER NOTE                                         STACKER NOTE
                   RESTORING DAMAGED STACVOL FILE HEADERS
                          (Applies to Stacker 4.x)
      STAC FAX  4701 (06-07-1994)
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      BACKGROUND
      
      This document addresses the error messages:
         - Not a Stacker Stacvol file-NOT MOUNTED
         - Invalid # reserved sectors (must be one) - NOT MOUNTED
           
      Each Stacker drive is actually a STACVOL.xxx file that is stored
      on the uncompressed drive. This file consists of a header that
      contains control information about how and where your data is
      stored, and a data area that contains all of your compressed
      data. If you receive one of the messages above, the header is
      damaged. However, Stacker saves a copy of the header for each
      Stacker drive. You may use this saved header to restore your
      STACVOL file.
      
      SOLUTION
      
          -Determine which saved header to use in the recovery process.
          -Restore the header using REPAIR.EXE.
           
      Determine which saved header to use.
      
      Note: These instructions assume that the Stacvol file on drive C
      is the one that is damaged. If the damaged file is on another
      drive, substitute that drive letter for C.
      
      Stacker frequently saves header information. When you start your
      computer, CHECK /WP saves the header as STACSAVQ.nnn; and when
      you start Windows or use the CHECK tool, the header is saved as
      STACSAVE.nnn. You must determine which of these files is newer.
      
                                  IMPORTANT
                 Do not use these procedures if you have run
                  SDEFRAG (the Stacker Optimizer), and you
                   have neither run CHECK nor successfully
                 restarted your computer afterwards. Contact
                 Stac Product Support for assistance in this
                                    case.
      
       1.  Start your computer, using a floppy disk if necessary.
           
       2.  At the DOS prompt, change to the root directory of your C
           drive and type:
           DIR STACSAV*.* /AH <enter>
           Note: if your version of DOS does not support use of the /AH
           switch to view hidden files, you must use a third party
           utility to see them.
       3.  Notice whether the file with the latest date and time is
           STACSAVE or STACSAVQ.
           
      Restore the header
      
       1.  From the root directory of drive C type: DIR /AH <enter>.
           Locate the file STACVOL.xxx. Record the exact spelling of
           this STACVOL file name.
       2.  You must clear the system, hidden, and read-only attributes
           from the STACVOL file. Type:
           C:\STACKER\SATTRIB -S -H -R C:\STACVOL.xxx <enter>
           For STACVOL.xxx enter the spelling of the STACVOL file you
           recorded above.
       3.  If the latest saved header as determined in the first
           procedure is STACSAVE, type:
           C:\STACKER\REPAIR /F C:\STACVOL.xxx <enter>
           where the xxx is the file extension you determined in step 1
           above.
       4.  If the latest saved header is STACSAVQ, type:
           C:\STACKER\REPAIR /F /Q C:\STACVOL.xxx <enter>
           where the xxx is the file extension you determined in step 1
           above.
       5.  Remove all disks from the floppy drives and restart your
           computer.
           
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      Copyright 1994 Stac Electronics
