Setup Unable to Upgrade Disk Manager Partitions > 512 MB (73264)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0

This article was previously published under Q73264


If you are running MS-DOS versions 3.x with an Ontrack Disk Manager partition that is larger than 512 MB, the Microsoft MS-DOS 5 Upgrade Setup program cannot convert the partition to an MS-DOS 5.0-compatible partition. This occurs because the Disk Manager partition sector sizes are not a power of 2.

If you replace your old Disk Manager DMDRVR.BIN driver with the DMDRVR.BIN shipped with the MS-DOS 5.0 upgrade and use the SETUP /U command, MS-DOS 5.0 will be installed. Upon booting the machine after upgrading, however, Disk Manager will display the following message:

Partition at.... = *NOT CONVERTED*, Invalid Sector Size
You will not be able to access the unconverted partition.


To work around this problem, uninstall to MS-DOS 3.x. Even though you replaced the Disk Manager device drivers, they will work with MS-DOS 3.x and the partition will be accessible. Contact Ontrack to get an upgraded version of Disk Manager and instructions to make that partition compatible with MS-DOS 5.0.

Modification Type: Major Last Reviewed: 11/23/1999
Keywords: KB73264