Q100794: MSBACKUP Fails on DEC or Dell with Logically Swapped Disks

Article: Q100794
Product(s): Microsoft Disk Operating System
Version(s): MS-DOS:6.0,6.2,6.22
Operating System(s): 
Keyword(s): 
Last Modified: 24-NOV-1999

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

- Microsoft MS-DOS operating system versions 6.0, 6.2, 6.22 
-------------------------------------------------------------------------------

SYMPTOMS
========

If you have a Digital Equipment Corporation (DEC) or Dell system and you use the
BIOS option to logically swap drives A and B, Microsoft Backup and Microsoft
Backup for Windows cannot back up or restore files to those drives.

CAUSE
=====

This problem occurs because Microsoft Backup reads from the floppy disk drive
through BIOS disk services but writes to the floppy disk drive directly through
the I/O ports.

Microsoft Backup can work successfully with logically swapped floppy disk drives
that are implemented by physically exchanging the hardware signals.

WORKAROUND
==========

You may be able to work around this situation by using MS-DOS Path as your
backup destination.


Additional query words: 6.00 logical msbackup.exe mwbackup.exe ms- dos-based windows-based 6.20

======================================================================
Keywords          :  
Technology        : kbMSDOSSearch kbMSDOS622 kbMSDOS620 kbMSDOS600
Version           : MS-DOS:6.0,6.2,6.22

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

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 1986-2002.