I would start with "What info is it showing?" "What info is it not showing?" "What additional info do you need to know?" Etc.
That being said, I've used the 3.9 version of HDToolbox for years and never had any problems with it not telling me everything I needed to know. You might be able to run the 3.9 version on a 3.1 system? Or use a 3.9 boot floppy to access the newer version of HDToolbox, at least?
One other tool that I do use occasionally is Thomas's Check4Gb program. Maybe this is what you're looking for?
http://thomas-rapp.homepage.t-online.de/downloads/check4gb.readme
