Cannot Restore DoubleSpace-Compressed Backup with MS-DOS 6.22 (148479)

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

This article was previously published under Q148479


If you back up files with compression using Msbackup.exe or Mwbackup.exe using MS-DOS 6.0 or 6.2 and you then install MS-DOS 6.22, you may not be able to restore your compressed backup.


In order to restore the backup, the MS-DOS 6.0 or 6.2 Dblspace.bin file and the Drvspace.mr1 file must be available on your hard disk.

NOTE: When you upgrade MS-DOS 6.0 or 6.2 to MS-DOS 6.22, the Dblspace.bin file should be left on the hard disk. However, if you install MS-DOS 6.22 to a clean hard disk, the version of Dblspace.bin from MS-DOS 6.0 or 6.2 is not available. The Drvspace.mr1 file is included with the DoubleSpace Conversion Kit. For additional information, please see the following article in the Microsoft Knowledge Base:

117806 DoubleSpace Conversion Kit: Description & How to Obtain


To resolve this problem, Microsoft has made the Dblspace.bin file from MS-DOS 6.2 available for download.

To restore your compressed backup, follow these steps:

    Install the DoubleSpace Conversion Kit (Dblconv.exe).
    Download the DBL622.EXE file from the Microsoft Download Center to an empty folder.
    Run the DBL622.EXE file you downloaded in step 2 by typing dbl622 at the MS-DOS prompt.
    Copy the Dblspace.bin file to the MS-DOS folder.
The following file is available for download from the Microsoft Download Center:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.


The following file is created when you run Dbl622.exe:
   File name      Size     Date       Version
   Dblspace.bin   64,246   09/30/93   6.20

Modification Type: Major Last Reviewed: 4/22/2003
Keywords: kbfile kbgraphxlinkcritical kbprb KB148479