3.5-inch MS-DOS 5 Upgrade May Fail with Early DOS Versions (75087)
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 Q75087
When upgrading to MS-DOS 5.0 or later from DOS versions earlier than
3.2, installation from the 3.5-inch MS-DOS 5 Upgrade disks may fail.
Most MS-DOS and OEM DOS versions earlier than DOS 3.2 do not support 3.5-
inch floppy drives and thus will not be able to correctly read all the
files on 720K disks. When the Setup command is run from MS-DOS 5 Upgrade
Disk 1 - Setup, the message "bad command or file name" will be displayed.
When the DIR command is used on one of the MS-DOS 5 Upgrade disks, all the
files will not be listed, or the filenames will displayed as garbage
(extended ASCII characters).
For example, IBM PC-DOS versions 3.0 and 3.1 will provide the following
information with the DIR command:
Setup Disk Files on Disk Files Displayed
---------- ------------- ---------------
1 37 5
2 28 0
3 52 27
Other OEM DOS versions may also exhibit the same behavior or display
To successfully install the MS-DOS 5 or later Upgrade, do one of the
• Obtain the 5.25-inch MS-DOS 5 or 6 Upgrade disks if the computer
system has a 5.25-inch floppy drive.
• If another computer that is running DOS 3.2 (or later) with 1.2 MB
and 3.5-inch floppy drives is available, and the current system has a
1.2 MB floppy drive, do the following:
• Copy all files from each 3.5-inch MS-DOS 5 or 6 Upgrade floppy
disk to three 5.25-inch 1.2 MB disks using the second computer.
• Label the disks as Disk 1, Disk 2, and Disk 3 using the LABEL
command. There should be six spaces between the word "Disk"
and the number in the volume label (for example, Disk 1).
• Run Setup from the 1.2 MB floppy drive on the first computer.
Start from a later DOS version that supports a 3.5-inch floppy drive,
such as MS-DOS or PC-DOS versions 3.2 or later, and run Setup.
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