How to Quick Format an MSBACKUP.EXE Disk (98181)

The information in this article applies to:
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q98181


If you use the /Q switch to quick format a floppy disk that was used to store backup files created by Microsoft Backup (MSBACKUP.EXE or MWBACKUP.EXE), you may receive the following error message:

Insufficient space for the MIRROR image file.
There was an error creating the format recovery file.
This disk cannot be unformatted.
Proceed with Format (Y/N)?


This error is generated because FORMAT cannot find enough space to create the mirror image file. If you choose Y to proceed, FORMAT formats the disk without saving any mirror information.


When Microsoft Backup uses more than one disk, it always uses the entire contents of the disk. To avoid this error, use the following command:

format /q /u <drive letter>:

The /U switch instructs FORMAT to perform an unconditional format of the floppy disk and saves no mirror information.

If the disk still cannot be quick formatted, use DELTREE to delete the backup file on the disk. For example, type deltree a:\*.* at the MS-DOS command prompt and then press ENTER.

Modification Type: Major Last Reviewed: 11/22/1999
Keywords: KB98181