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      STACKER NOTE                                         STACKER NOTE
                       DOS DRIVE LIMITS AFTER UPGRADE
                          (Applies to Stacker 4.0)
      STAC FAX  4007 (03-11-1994)
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      BACKGROUND
      
      In certain cases you may find that your drive size does not
      increase after upgrading to Stacker 4.0. This occurs when you are
      near the DOS limit for that drive. DOS's limits are related to
      the size of clusters used on the drive. The following table
      compares cluster size and drive size.
      
      Cluster Size (Allocation Unit)      Largest Logical Drive Size
                   8KB                              512MB
                   16KB                         1GB (1024MB)
                   32KB                         2GB (2048MB)
      
      Stacker 4.0's Setup tries to give your drive the advantage of
      increased compression when you upgrade. But that increased
      compression may require your drive to cross the boundary between
      one cluster size and the next. Because Stacker cannot dynamically
      change cluster size, your drive is limited to the largest
      drive possible for the current cluster size.
      
                                    Note
         StacFax 4505 discusses large compressed drives & cluster size.

      SOLUTION
      
         - Accept the current configuration.
         - Uncompress your drive and re-run Setup.
         - Shrink then grow the Stacker drive.
           
      Accept the current configuration
      
      If you prefer your current configuration, simply use your system
      as before. You will still benefit from Stacker's improved safety,
      the new Stacker Toolbox, and use of DPMS if you have DOS 6 or above.
      
      Uncompress your drive and re-run Setup
      
      Uncompress all your Stacker drives then run Stacker Setup again.
      This will allow Stacker to select the proper cluster size for
      your drive in relation to the data on the drive and the expected
      compression ratio. See your Stacker User's Guide for instructions
      on uncompressing your drive.
      
      Shrink then grow the Stacker drive
      
       1.  Go to the DOS prompt and change to the Stacker directory.
           Type STACKER <enter>. Look for a line something like this:
           Drive C was drive C at boot time [D:\STACVOL.DSK = 448.2MB]
           Note the size of the STACVOL file listed.
       2.  See chapter 4 of the Stacker User's Guide for instructions
           to make your Stacker drive smaller. You will be using the
           option to make more uncompressed space. When asked how much
           uncompressed space to add, use this formula:
           (Size of STACVOL file [noted above]) minus (Largest drive size
           allowed by cluster size)  divided by  (2.5)
      
           For example, if your STACVOL file is 448.2MB, and you have
           16K clusters, you would  add 38.6MB of uncompressed space.
           448.2 - (1024/2.5) = 38.6.
       3.  After the resizing of the Stacker drive is complete, use the
           Stacker Toolbox to run the Stacker Optimizer, choosing Full-
           MaxSpace.
       4.  After the optimization is complete, again change your
           Stacker drive size. In this case, choose the option to
           increase your Stacker drive. Grow it to the maximum size
           offered.
       5.  You will have unused uncompressed space on your drive after
           you complete this procedure. If you wish, you may use the
           Stacker Toolbox to create an additional Stacker drive on
           that space.
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      Copyright 1994 Stac Electronics
