BACKUP Fails When Writing Log File to Unformatted Disk (72132)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
This article was previously published under Q72132
The BACKUP command in MS-DOS version 5.0 does not work correctly when the
destination disk is unformatted and you try to write a log file to that
BACKUP appears to be trying to write the log file to the destination disk
before formatting the disk. For example, the following command results in
an error if the disk in the destination drive is unformatted:
backup c:\dos5\*.exe a: /f:360 /l:a:\backup.txt
The disk in drive A spins for a short time, at which point the following
message is displayed:
General failure error reading drive A
Abort, Retry, Fail?
Choosing each of the three options produces different behavior:
• Choosing Abort causes the program to be successfully aborted.
• Choosing Retry causes the error to be repeated.
• Choosing Fail results in BACKUP asking for a disk to be inserted
into drive A and produces the following message:
WARNING! Files in target drive A:
After a key is pressed, the FORMAT command is invoked, and the disk
is successfully formatted. The following message then appears:
A:\ root directory will be erased
Press any key to continue . . .
It is quickly followed by the message:
***Backing up files to drive A:***
Diskette Number: 01
Error opening logfile
At this point, the BACKUP program terminates and the DOS prompt
appears. The disk in Drive A has no files and contains a label of
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