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From: noelroy@kean.mun.ca (Noel Roy, Economics Dept., Memorial University)
Newsgroups: comp.sys.ibm.pc
Subject: Corrupted BACKUP disks running MS-DOS 3.3
Message-ID: <21856@kean.mun.ca>
Date: 18 Oct 89 14:08:38 GMT
Organization: Computing Services, Memorial University. St.John's Nfld, Canada
Lines: 45

I seem to be getting contaminated BACKUPID.@@@ files on my DOS BACKUP 
diskettes.  I am running DOS version 3.3+, from Zenith.

Symptoms are as follows:  normally, BACKUPID.@@@ is a file of 128 
bytes, with the last 122 padded with zeroes.  The first six bytes 
contain information on date written, diskette number, and whether the 
diskette is full.

The sixth byte (the one immediately before the padded zeroes) contains 
the month in hexadecimal.  It was working fine through November 
(months 01 through 09).  Beginning in October, instead of writing 0A, 
it writes 0D 0A, and then adds the zeroes.  The size of the file 
increases to 129.

As a result, RESTORE does not recognize the diskette as valid, and 
aborts.

This corruption occurs even after a clean boot, with no resident 
programs.

When the system date is reset to September, the corruption does not 
occur.

The patch to BACKUPID.@@@ is fairly trivial, but a nuisance 
nevertheless.

Has anyone else noticed this problem?  Is this a bug  in BACKUP.COM, 
or do I have system problems?

_________________________________________________________________________
|                                                                       |
| Dr. Noel Roy                                                          |
| Room A3048                                Phone (709) 737-8245/8      |
| Department of Economics                   FAX   (709) 737-4569        |
| Memorial University of Newfoundland                                   |
| St. John's, Newfoundland A1C 5S7 Canada                               |
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| bitnet:   NOELROY@MUN                                                 |
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