Microsoft KB Archive/31840

Restoring Files Backed Up with MS-DOS Version Earlier than 3.3 PSS ID Number: Q31840 Article last modified on 02-10-1993 PSS database name: O_MSDOS

3.30 3.30a

MS-DOS

Summary:

The MS-DOS version 3.3 BACKUP command uses a different file format to store files that have been backed up. Because of this different format, the RESTORE command in MS-DOS 3.3 must be able to restore the new format as well as the old format.

MS-DOS 3.3 RESTORE command should be able to restore files backed up under most other versions and dialects of the BACKUP command, provided the OEM version of MS-DOS did not modify the BACKUP file format. The only version of BACKUP that creates files that cannot be restored under MS-DOS 3.3 RESTORE command are disks that were created with MS-DOS 3.2 BACKUP command. Use the MS-DOS version 3.2 RESTORE command to restore these files, or use the V32SLASH utility included with the “MS-DOS Backup/Restore Supplemental Utilities” application note before restoring the backup disks with the MS-DOS 3.3 RESTORE command. For more information about this application note, query on the following words in the Microsoft Knowledge Base:

appnote and pd0315

The following MS-DOS versions create backup disks that have been successfully restored by the MS-DOS 3.3 RESTORE command:


 * MS-DOS version 3.21
 * MS-DOS version 3.3
 * MS-DOS version 4.0x
 * MS-DOS version 5.0
 * IBM PC-DOS version 2.1
 * IBM PC-DOS version 3.0
 * IBM PC-DOS version 3.2
 * IBM PC-DOS version 3.3
 * IBM PC-DOS version 4.0x
 * IBM PC-DOS version 5.0

Additional reference words: 3.30 3.30a

Copyright Microsoft Corporation 1993.