MS-DOS 6.21: Errors Restoring Compressed Backups (113775)


The information in this article applies to:

  • Microsoft MS-DOS operating system 6.21
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:

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>.

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.

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.

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.

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

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

MORE INFORMATION

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

  1. Choose Backup.
  2. Choose Options.
  3. Clear the Compress Backup Data check box.
  4. Choose OK.
Modification Type:MajorLast Reviewed:11/20/1999
Keywords:KB113775
©2002 Microsoft Corporation. All rights reserved.