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      STACKER NOTE                                         STACKER NOTE
               "NOT ENOUGH SPACE TO SAVE HEADER" RUNNING CHECK
                          (Applies to Stacker 4.0)
      STAC FAX  4608 (05-19-1994)
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      BACKGROUND
      
      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. The CHECK utility saves a copy of the header of each
      Stacvol file whenever it is run. If the header is damaged, this
      saved copy may be used to repair the damage. Check is run every
      time you start your system, Check Integrity from the Stacker
      Toolbox, or enter CHECK from the command line. If there is
      insufficient space on the uncompressed drive to save the header
      of the Stacvol file, you will receive an error message
      "drive:WARNING: not enough disk space to save header". Drive: is
      the letter of the Stacker drive whose header could not be saved.
      
      SOLUTION
      
         - Determine the uncompressed drive for your Stacker drive
         - Determine the approximate space required to save the Stacvol
           header
         - Make sufficient space to save the header
           
      Determine the uncompressed drive for your Stacker drive
      
       1.  At the DOS prompt type: STACKER <enter>
       2.  A drive map will be displayed. Locate the line that displays
           the drive letter in the error message. For example:
           Drive D was drive D at boot time [F:\STACVOL.DSK = 123.4MB]
       3.  Note the drive letter in brackets. In this example it is
           drive F. This is your uncompressed drive. Also note the name
           of the Stacvol file, in this case STACVOL.DSK.
           
      Determine the approximate space required to save the Stacvol
      header
      
       1.  Change to the uncompressed drive. Type: DIR <enter>. Note
           the number of bytes free.
       2.  Type DIR /AH <enter>. This will display the hidden files on
           the drive. Locate the Stacvol file name that you noted above
           (STACVOL.DSK in this example) and write down its size. If
           your version of DOS does not support viewing hidden files
           using the /AH switch, use a third party utility or Windows
           File Manager to locate the Stacvol file.
       3.  Compare the size of the Stacvol file to the chart below to
           determine the approximate space required to save the header
           information. Only certain file sizes are listed, and you may
           extrapolate as necessary.
           STACVOL file size      Minimum Space Required to Save Header
           	50MB 				94KB
           	120MB 				108KB
           	200MB 				171KB
           	500MB 				207KB
           	1000MB 				396KB
           1KB = 1024 bytes
       4.  Compare the bytes free with the approximate space you
           extrapolated above. Note the additional space needed to save
           the header.
           
      Make sufficient space to save the header
      
       1.  At the DOS prompt type SDEFRAG /GP <enter>
       2.  Select the drive that was the subject of the error message.
       3.  Select "More Uncompressed Space Available."
       4.  The drive will be defragmented, and then you will be
           presented with an option to enter the desired amount of
           uncompressed space in KB. Your current uncompressed space
           will be listed, and it should be less than the space
           required that you extrapolated above. Add 50KB to the space
           required and enter the result in the field provided.
       5.  Select "Perform changes on Stacker drive."
       6.  Restart your system to let the changes take effect. You
           should receive no error messages.
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      Copyright 1994 Stac Electronics
