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      STACKER NOTE                                         STACKER NOTE
                  FILES REQUIRED ON THE UNCOMPRESSED DRIVE
                      (Applies to Stacker version 4.0)
      STAC FAX  4507 (02-18-1994)
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      BACKGROUND
      
      Stacker requires that certain files be stored in two places, for
      startup and recovery purposes. The requirements are different
      for Stacker 4.0 under MS-DOS 6 than for versions that don't use
      preloading. Stacker Setup doesn't remove any files. After Setup,
      you can remove any files from the uncompressed drive that this
      version of Stacker doesn't need. Please note that this document 
      addresses MS-DOS only.
      
      SOLUTION
      
         -  Duplication Required by Stacker 4.0 preloading version.
         -  Duplication Not Required After Upgrading From an Earlier
            Stacker.
         -  Duplication Required for non-preloading versions.
           
      Duplication Required by Stacker 4.0, preloading version.
      
      If you are using MS-DOS 6.x, PC-DOS 6.x with file dates after 9-
      30-93, or Novell DOS 7, Stacker will preload its compression
      drivers. The following files must be stored in the uncompressed
      startup drive. If you remove any of them, your system may not be
      able to start or they won't be available if you need technical
      support.
      
               MS-DOS 6 Files                   Stacker Files
               --------------                   ---------------
               MSDOS.SYS  (hidden)            STACKER.COM
               IO.SYS  (hidden)               SYSINFO.EXE
               DBLSPACE.BIN  (hidden)         CONFIG.EXE
               COMMAND.COM                    ED.EXE
               ATTRIB.EXE                     STACVOL.XXX (hidden)
               CHKDSK.EXE                     STACKER.INI (hidden)
                                              STACSAVX.NNN (hidden)
                                              STACKER.LOG  (read-only)
                                              CHECK.EXE
                                              STACKER2.BIN (hidden)
      
      Duplication Not Required After Upgrading From an Earlier Stacker
      
      Under Stacker 2.0 and Stacker 3.0 for Windows & DOS, all files
      referred to in the CONFIG.SYS file were stored on both the
      compressed and uncompressed startup drives. Stacker kept the
      files synchronized to make sure they were the same in both
      locations. This ensured that DOS could find the files it needed
      during startup.
      
      Upgrading to Stacker 4.0 and MS-DOS 6 preloading means that any
      drive letter switching is finished by the time DOS processes the
      CONFIG.SYS and AUTOEXEC.BAT files. If you wish to conserve space
      on your uncompressed startup drive, you can delete those two
      files. You can also delete the files on the uncompressed drive
      that are referred to in the CONFIG.SYS file, such as device
      drivers. Don't remove them from the compressed startup drive (C).
      Also be sure to leave the files listed in the section above
      (Duplication Required by Stacker 4.0, preloading version) on the
      uncompressed startup drive
      
      Duplication Required by Stacker 4.0, non-preloading version.
      
      If you are using a version of DOS that does not support
      preloading, then Stacker must load as a device driver in your
      CONFIG.SYS file. Therefore your uncompressed startup drive will
      require all of the files listed in the first section (Duplication
      Required by Stacker 4.0, preloading version), plus a few more.
      You will need copies of your CONFIG.SYS and AUTOEXEC.BAT files,
      and Stacker's SSWAP.COM on the uncompressed drive. Also, you will
      need copies of all files referred to in your CONFIG.SYS that
      appear before the Stacker lines. Normally you will not have to
      place these files on the uncompressed drive manually. Stacker's
      synchronization feature will put the correct files on the
      uncompressed drive for you automatically.
      
      
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      Copyright 1994 Stac Electronics