Using BACKUP/F After Installing the MS-DOS 5 Upgrade (75837)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
This article was previously published under Q75837
After installing the Microsoft MS-DOS 5 Upgrade, the BACKUP command
can return the message "Incorrect DOS version" if you try to format
a disk during the backup procedure using the /f[:size] parameter.
BACKUP can appear to work correctly for the first few disks, but when
the BACKUP command tries to back up the OLD_DOS.X directory it attempts
to use the older version of FORMAT.COM.
To correct the problem, remove or rename all old FORMAT.COM files from
your computer OR delete the OLD_DOS.X directory using DELOLDOS.EXE.
To find all occurrences of FORMAT.COM, type the following from the
More information on the BACKUP command can be found in the "Microsoft
MS-DOS User's Guide" on pages 370-373.
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