DOCUMENT:Q80297  17-DEC-2000  [msdos]
TITLE   :FASTOPEN Should Not Be Used with Speed Disk or Compress
PRODUCT :Microsoft Disk Operating System
PROD/VER:MS-DOS:3.x,4.01,5.0,6.0,6.2,6.21,6.22
OPER/SYS:
KEYWORDS:

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft MS-DOS operating system versions 3.1, 3.2, 3.21, 3.3, 3.3a, 4.0, 4.01, 5.0, 6.0, 6.2, 6.21, 6.22 
-------------------------------------------------------------------------------

SUMMARY
=======

The Norton SpeedDisk utility, PC Tools Compress utility, or any disk
optimization utilities are not compatible with the MS-DOS FASTOPEN.EXE utility.

Microsoft has confirmed that in order to avoid data corruption, FASTOPEN.EXE
should not be loaded when using a disk optimization or disk compaction utility.
This is usually done by disabling or removing the FASTOPEN command in the
AUTOEXEC.BAT or CONFIG.SYS file and rebooting the system before the disk
optimizer is used.


MORE INFORMATION
================

FASTOPEN.EXE stores the locations of files and directories in memory, making
access to these files faster than normal. Disk optimizers like Speed Disk and
Compress move files around, changing the location of the file. However,
FASTOPEN.EXE does not realize that the file has been moved, and if the file is
accessed after the disk optimization, the file is not properly read because
FASTOPEN accesses the file's old location. This can cause file and data
corruption.

For more information on FASTOPEN.EXE and disk optimizers, query on the following
words:

   " FASTOPEN DISK OPTIMIZER " (without the quotation marks)

Symantec, manufacturer of Norton Utilitis, has released Norton Utilities version
6.01, which prompts you to disable FASTOPEN.EXE to prevent you from optimizing
the disk with it in memory. Owners of Norton Utilities 6.0 may call Norton
technical support at (213) 319-2000 to obtain a free upgrade to version 6.01.

Reference(s):

"Microsoft MS-DOS User's Guide and Reference," version 5.0, page 487

Additional query words: 6.22 5.00 6.00 6.20

======================================================================
Keywords          :  
Technology        : kbMSDOSSearch kbMSDOS321 kbMSDOS400 kbMSDOS320 kbMSDOS330a kbMSDOS621 kbMSDOS622 kbMSDOS620 kbMSDOS600 kbMSDOS310 kbMSDOS500 kbMSDOS330 kbMSDOS401
Version           : MS-DOS:3.x,4.01,5.0,6.0,6.2,6.21,6.22

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2000.