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      STACKER NOTE                                         STACKER NOTE
                USING DISK REPAIR UTILITIES ON STACKER DRIVES
                      (Applies to Stacker Version 4.0)
      STAC FAX  4412 (08-17-1994)
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      BACKGROUND
      When an application exits improperly, a damaged file, such as a
      temporary swap file or a document, may be left behind.  This
      damaged file would be present whether or not Stacker is
      installed.  You can use multipurpose disk repair utilities such
      as Norton Disk Doctor or PC Tools Diskfix to fix most file system
      problems.  If you don't have a disk repair utility, you can use
      CHKDSK instead, but its repair capabilities are limited.
      
      SOLUTION
      
         - First, run CHECK
         - Run the disk repair utility
         - DOS issues unrelated to Stacker
           
      First, run CHECK
      
       1.  Type CHECK /F and press <Enter>.
       2.  When CHECK prompts you to repair the drive, type yes and
           press <Enter>.  NOTE:  If CHECK reports IOCTL ACCESS DENIED
           ERROR #27, see StacFax #4706
       3.  If CHECK reports damaged files, it will prompt you to
           "delete the damaged files listed above so that all the
           errors may be corrected?"  Read StacFax #4708.
           
      Run a disk repair utility
      
      Start your disk repair utility and follow its instructions.
      Remember, if you're using CHKDSK, you have to specify the /F
      switch to correct errors:  CHKDSK /F <Enter>.
      
      NOTE:  SCANDISK is a disk repair utility included with MS-DOS
      6.2.  When you run CHKDSK /F, it'll urge  you to run SCANDISK
      instead.  It'll also ask you if you wish to continue with CHKDSK
      anyway. Answer "yes". It's perfectly safe to run SCANDISK on a
      Stacker drive, but if it reports a bad cluster or a read error or
      a decompression error, it won't be able to fix it.
      
      If your disk repair utility is Norton Disk Doctor, turn off
      compression checking before running it. From the command line you
      can type: NDD /NOCOMP <enter>. See your Norton Utilities
      documentation or StacFax 4408 for more details.
      
      DOS issues unrelated to Stacker
      
      The following DOS errors and conventions are not widely
      publicized, and due to their relative obscurity, they are
      sometimes mistaken for Stacker errors.  However, they are not
      compression-related and can occur whether or not Stacker is on
      your system.  Consult your DOS user's guide or disk repair
      utility's documentation for details on correcting these DOS
      errors.
      
         - CONVERTING LOST CHAINS TO FILES.  Files consist of smaller
           units called clusters that DOS "chains" together.  The
           starting cluster "points" to the second cluster, the second
           to the third, and so on.  If a file chain is broken, all of
           the clusters past the break become "lost chains."
           If you convert lost chains to files using a disk repair
           utility, you'll wind up with one file for each lost chain.
           Unless you are an expert at data recovery, you probably
           won't be able to piece the chains together.  If you don't
           convert lost chains to files, the disk repair utility
           reclaims them as free space.
         - CROSSLINKED ENTRIES are files or directories which
           incorrectly share the same space on the disk.  Most disk
           repair utilities correct this problem, but CHKDSK can't.  If
           you don't have a disk repair utility, you have to delete the
           crosslinked files manually.
         - INVALID SUB-DIRECTORY ENTRIES  represent corrupted directory
           structures.    Most disk repair utilities correct this
           problem, but CHKDSK usually can't.  If you don't have a disk
           repair utility, you have to remove or delete the invalid sub-
           directory entries manually.
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      Copyright 1994 Stac Electronics
