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      STACKER NOTE                                         STACKER NOTE
                           GROWING A STACKER DRIVE
                          (Applies to Stacker 4.0)
      STAC FAX  4405fix (09-16-1994)
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      BACKGROUND
      
      If you decide that you wish to grow your Stacker drive, you may
      do so from the Stacker Toolbox. Please note that your Stacker
      drive is also a large STACVOL file. Growing a Stacker drive
      entails growing this file. In certain configurations you may find
      that you are unable to grow a drive. This document will explain
      those circumstances and provide work-arounds.
      
      SOLUTION
      
         - Use the Stacker Toolbox to grow the drive.
         - Limitations on growing a Stacker drive.
           
      Use the Stacker Toolbox to grow the drive.
      
      You may use the Stacker Toolbox in either Windows or DOS to
      change your Stacker drive size. Full details are contained in
      Chapter 4 of your Stacker User's Guide. If you also received an
      addendum to the User's Guide with your purchase, check it for
      additional information.
      
       Limitations on growing a Stacker drive.
      
      There are circumstances where you may not be able to grow your
      Stacker drive.
      
       1.  A Stacker drive can only be grown to twice its original size.
           If you try to grow it any more you will receive an error
           message. In this case, the only solution is to uncompress the
           drive, and run Setup again.
       2.  If your Stacker drive has been updated from an earlier
           Stacker version. Run HCONVERT. You will need enough
           uncompressed space on the drive for the HCONVERT program to
           temporarily store a copy of the STACVOL header. Note that
           some updated Stacker drives may be limited by DOS from
           growing. See StacFax 4010 for details.
           a.   Exit Windows, if necessary. At the DOS prompt type:
           STACKER <enter>
           You will see a display something like this:
           Drive C was drive C at boot time [ D:\STACVOL.DSK = 125MB ]
           Drive D was drive D at boot time.
           Note the drive letter in brackets, drive D in this case.
           That is your uncompressed drive. The Stacker drive is drive
           C.
           Also note the size of the STACVOL file, in this case 125MB.
           You will be growing the STACVOL file later to a larger size.
           b.   Make sure the drives have no errors. Run Stacker's
           CHECK utility against the Stacker drive, and CHKDSK against
           the uncompressed drive. For example:
           CHECK C: <enter>
           CHKDSK D: <enter>
           If there are errors on either drive, run the appropriate
           utility again, but add the /F parameter to the command.
           c.   Type:
           HCONVERT /C D:\STACVOL.DSK /=MG=XXX <enter>
           where D: is the drive letter of the uncompressed drive, and
           XXX is the desired size of the STACVOL file. To determine
           the desired size of the file, decide how big you wish your
           Stacker drive to be. Divide this by 2.5 (which is the
           default Expected Compression Ratio.) Round to the nearest
           whole number. This gives you the approximate size of the
           STACVOL file that you will need. Substitute the result for
           the XXX above.
           d.   After HCONVERT finishes, use the Stacker Toolbox to
           change the size of your Stacker drive.
       3.  If you have previously shrunk your Stacker drive, the
           Expected Compression Ratio (ECR) may be out of alignment
           with the Actual Compression Ratio(ACR). You may not be able
           to grow the Stacker drive. If so, open the Stacker Toolbox
           in DOS. Select Expected Compression, and then the drive
           letter you are working with. Set the ECR to match the ACR.
           After the operation completes, use the Toolbox again to
           change the Stacker drive size.
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      Copyright 1994 Stac Electronics
