"Wrong Disk" Error When Installing MS-DOS (73090)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
• Microsoft MS-DOS operating system 5.0a
• Microsoft MS-DOS operating system 6.0
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q73090
Your computer repeatedly prompts for the same Microsoft MS-DOS 5, 6,
or 6.2 Upgrade disk. When you insert the disk, one of the following
error messages is displayed:
where <x> is the floppy drive letter.
The computer then prompts for the same disk again.
Run Setup from the hard drive.
To run Setup from the hard drive, do the following:
• Create a new directory on the hard drive.
• Use the XCOPY command to copy all files from all of the MS-DOS
Upgrade disks to the directory you created in step 1.
• Run Setup from the directory you created in step 1.
If the computer repeatedly prompts for one of the Uninstall disks,
check the following:
• Disable the change line support for the floppy drive. To do this,
add a DRIVPARM command to the CONFIG.SYS file. For example, if the
drive in question is drive A and the drive supports 1.2 MB disks,
the proper command is:
NOTE: There is no /C switch in the line. For more information on
the DRIVPARM command, see page 455 of the version 5.0 "Microsoft
MS-DOS User's Reference" or the Online Help for version 6.0 or 6.2.
• Setup cannot use an Uninstall disk that has a volume label that
matches one of the distribution disks. Delete the volume label of
the Uninstall disk using a command such as the following:
When the following prompt is displayed:
• Try an unformatted disk.
• Make sure that you aren't putting a high-density disk in a
• Setup prompts for a size if it determines that the disk is
unformatted. Make sure that you choose to format the disk as the
• If the Uninstall disk has NOT been created, rename the CONFIG.SYS
and AUTOEXEC.BAT files, reboot the computer, and try again.
• If the Uninstall disk has been created:
• Boot off of the Uninstall disk.
• Choose to uninstall.
• Rename CONFIG.SYS and AUTOEXEC.BAT.
• Start over.
• Make sure you are inserting the disk for which the computer is
prompting. If the disks are high density, Uninstall #2 won't be
needed, and you may have inserted this disk instead of the upgrade
disk that is required.
• Run Microsoft Anti-Virus (MSAV) from the MS-DOS 6.0 or 6.2 disks
(disk 3 of the 1.44 MB disk set and disk 4 of the 1.2 MB disk set)
to scan and clean any virus. The Michelangelo virus may cause the
MS-DOS 6.0 or 6.2 Setup process to hang and repeatedly ask for the
Uninstall disk. (This seems to happen when Setup is approximately 5
If you suspect that your computer has a virus and you are using MS-DOS 6.0
or later, run Microsoft Anti-Virus. If you are running an earlier version
of MS-DOS, either obtain MS-DOS 6.0 or later, or obtain help from a third-
party virus-correction service or vendor.
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