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STACKER NOTE                                                   STACKER NOTE
Title: Stacker and MS-DOS DOS 6.0 (Applies to Stacker 2.x and 3.0)
STAC FAX Index #2304 - 04/02/93                         
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Background.

   The information provided in this Stacker Note addresses issues related
   to compatibility between Stacker and MS-DOS 6.0. Stacker 2.x and 3.0 are   
   completely compatible with MS-DOS versions 3.2 and above, including MS-DOS 
   6.0. The MS-DOS setup program will detect Stacker's presence and install 
   files to the appropriate drives. This eliminates the need for DOS 
   installation batch files such as STACDOS5.BAT to perform a DOS upgrade.

   Microsoft includes a data compression product with MS-DOS 6.0. It is not  
   possible to run multiple data compression products simultaneously on a 
   single computer. DO NOT attempt to Stack a DoubleSpace compressed drive 
   with Stacker 2.x or 3.0. The result could cause data loss. The MS-DOS 6.0  
   installation will not offer to use the DoubleSpace compression program on 
   your Stacked drive.

Installing MS-DOS 6.0 on a Stacker Drive.

   The DOS 6.0 setup program is aware of data compression programs. To install  
   MS-DOS 6.0 on a Stacker drive, use the normal DOS SETUP command. The setup  
   program will detect your Stacker drive and following message will appear:
   
           "Your computer uses a disk compression program.
            Setup can install MS-DOS on your computer.
            However, you will not be able to un-install
            MS-DOS during or after setup. For more information
            see 'Diagnosing and Solving Problems'."

   Setup will recommend to continue with the installation process. Installing  
   the utilities that are offered during the setup process will not impact 
   your Stacked system. Setup will not offer to install DoubleSpace if it 
   detects another compression program on your system.

   The DOS 6.0 system files will be properly transferred to the uncompressed  
   portion of the boot drive during installation. Any DOS device drivers that 
   are referenced in your CONFIG.SYS file will also be properly updated on 
   the uncompressed drive by the DOS setup program. It will be necessary to 
   manually update any DOS program that is located in the DOS directory on 
   the uncompressed drive, but is not referenced in your CONFIG.SYS file. For 
   example, to determine which drive is the uncompressed boot drive type 
   STACKER and press ENTER. The output will look similar to the following:

   Stacker Disk Mount Utility - 3.00, (c) 1990-92 Stac Electronics,
   Carlsbad, CA
   Registered to: Stac Electronics
     Stacker drive map:
     Drive C: was drive D: at boot time  [ D:\STACVOL.DSK = 80.30MB ]

   Look for the drive that C was at boot time. In the example drive C was drive 
   D at boot time, so drive D is the uncompressed boot drive. Now that you have 
   identified the uncompressed boot drive, copy CHKDSK.EXE from the DOS 
   directory on your compressed Stacker drive to the DOS directory on the 
   uncompressed drive. Do the same with any other DOS file that did not get 
   updated on the uncompressed boot drive. It is recommended that you keep a 
   copy of COMMAND.COM in the DOS directory on the uncompressed drive. 
   Stacker's boot file synchronizer may update COMMAND.COM automatically for 
   you. If it does not, manually copy COMMAND.COM to the DOS directory on the
   uncompressed  boot drive.


Installing Stacker on an MS-DOS 6.0 System.

   Stacker versions 2.x and 3.0 will install fine on any system that is 
   running MS-DOS 6.0. They are FULLY COMPATIBLE. However, it is important  
   that you DO NOT install Stacker on a drive that has been compressed with 
   the Microsoft DoubleSpace compression utility. Doing so could result in 
   data loss. If you wish to use Stacker and you have already compressed your  
   drives with DoubleSpace, follow the instructions in your MS-DOS 6.0 users 
   guide for removing DoubleSpace before installing Stacker.

   As indicated in the Stacker Users Guide, disable any Anti Virus programs 
   before running the Stacker setup program. This includes the Anti Virus 
   program that is a part of MS-DOS 6.0.




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Copyright 1993, Stac Electronincs