MS-DOS 6.21: Errors Restoring Compressed Backups

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This article was previously published under Q113775

SYMPTOMS

When you use an original equipment manufacturer (OEM) version of Microsoft MS-DOS 6.21 Backup to restore backups created with an earlier version of Microsoft Backup, you receive one of the following error messages:

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MS-DOS 6.21 Backup (MS-DOS-Based Version)

Critical Error

Cannot retrieve catalog <filename> from disk #1 in drive A.

-or-

Alert

Compression failure within <filename>.

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MS-DOS 6.21 Backup for Windows

The compression header for the catalog is corrupt. Use rebuild to reconstruct the catalog.

-or-

The file <filename> could not be properly restored. Do you want to skip this file?

-or-

The compression header for the file <filename> is corrupt. Restore cannot process this file and must stop.

-or-

Cannot recover data from damaged diskette using error correction (ECC)

NOTE: This message is displayed when you try to retrieve or rebuild the backup catalog.

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CAUSE

Compression code was removed from Microsoft Backup in MS-DOS 6.21. When you use Microsoft Backup 6.21 to restore backups made with compression turned on, you receive the errors noted above.

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RESOLUTION

If you are restoring backups made on another computer, re-create the backups with compression turned off.

If you cannot re-create the backups, use the MS-DOS Expand utility (EXPAND.EXE) to expand the required files (using the table below for reference) from the original MS-DOS 6.0 or 6.2 disks.

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Files Required for Microsoft Backup (MS-DOS-Based Version)

   MSBACKDB.OVL
   MSBACKDR.OVL
   MSBACKFB.OVL
   MSBACKFR.OVL
   MSBACKUP.EX_    MSBACKUP.EXE
   MSBACKUP.HL_    MSBACKUP.HLP
   MSBACKUP.OVL
   MSBCONFG.HL_    MSBCONFG.HLP
   MSBCONFG.OVL

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Files Required for Microsoft Backup for Windows

   MWBACKF.DL_     MWBACKF.DLL
   MWBACKR.DL_     MWBACKR.DLL
   MWBACKUP.EX_    MWBACKUP.EXE
   MWBACKUP.HL_    MWBACKUP.HLP
   MWGRAFIC.DL_    MWGRAFIC.DLL
   VFINTD.38_      VFINTD.386

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MORE INFORMATION

To change the compression setting in Microsoft Backup 6.0 or 6.2:

Choose Backup.
Choose Options.
Clear the Compress Backup Data check box.
Choose OK.

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APPLIES TO

Microsoft MS-DOS 6.21 Standard Edition

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KB113775

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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