Umsdos has some use even for Ext2 (Native Linux
file-system) users. One common scenario is this:
Linux being your OS of choice, the Linux
partition start to fill and fill and fill.
Your DOS partition is collecting dust, being half empty.
You are suddenly out of space in the Ext2 partition.
You are still not sure you want to get rid of DOS.
Umsdos may save the day here. You can setup a Linux
directory in the DOS partition and use it without restriction
for Linux usage. For example, say you want to setup a new
directory named "extra" in your C: drive. And you want this
directory to behave as a normal Linux directory. Do this
(assuming that C: is /dev/hda1).