MS-DOS Shell and the Colorado Tape Backup System (74454)

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

This article was previously published under Q74454


You have a Colorado Tape Backup on your system, and when you try to exit a program that has been run from MS-DOS Shell, you receive an error message similar to one of the following:

Unable to Load MS-DOS Shell


Unable to Unload MS-DOS Shell
If you choose the RETRY button you are returned to MS-DOS Shell. If you choose the NO button, you are returned to the MS-DOS command prompt.


According to Colorado Memory Systems, when you load the automatic backup program from the AUTOEXEC.BAT file, it causes a memory conflict with Shell. If its automatic tape backup program is loaded from the AUTOEXEC.BAT file, it does not leave enough memory for Shell to operate properly.


A workaround for this problem is to load the automatic tape backup program from the MS-DOS command prompt, instead of the AUTOEXEC.BAT file.


The product included here is manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this products' performance or reliability.

Modification Type: Major Last Reviewed: 10/16/2003
Keywords: KB74454