Microsoft KB Archive/62577

Internal Format Of MS-DOS BACKUP Files PSS ID Number: Q62577 Article last modified on 12-30-1992 PSS database name: O_MSDOS

4.00

MS-DOS

Summary:

The format of the control file named BACKUPID.@@@ and the format of the 128-byte header added to each backed-up file is documented on Pages 746-747 of the “MS-DOS Encyclopedia,” 2nd edition, by Ray Duncan.

More Information:

The following is a copy of this information:

BACKUPID.@@@ Files
Byte Value Use —- —– —

00H 00 or FFH Not last floppy disk/last floppy disk 01-02H nn Floppy disk number in low-byte/high-byte decimal format 03-04H nnnn Full year in low-byte/high-byte order 05H 1-31 Day of the month 06H 1-12 Month of the year 07-0AH nnnn Standard MS-DOS system time if the /T:time switch was used; otherwise 0 0B-7FH 00 Not used

BACKUP Files
Byte Value Use —- —– —

00H 00 or FFH Not last floppy disk/last floppy disk on which this file resides 01H nn Floppy disk number 02-04H 00 Not used 05-44H nn File’s full pathname, except for drive designator 45-52H 00 Not used 53H nn Length of the file’s pathname plus one 54-7FH 00 Not used

Additional reference words: 4.00

Copyright Microsoft Corporation 1992.