TESTFDC usage

I've been checking through the stuff I have around here and I've decided that I have a few surplus PC mobos that I'll be getting rid of (via a certain auction site). Before I do I thought I'd try them out with TESTFDC and see what it says. I have three 5.25" drives (of currently unknown functionality) which I could use. One is a DEC RX33, one is a Tandon TM75-8 and the last one is a Sankyo (or that might just be the motor manufacturer :-)). I also have whatever is sitting in my main machine, but I'm not keen to drag that out just foir fun! I also have a few 1.44MB 3.5" drives, but they've not been used in quite some time, so heaven knows what state they are in. So what do I need to do to extract the maximum useful information about these motherboards (aside, that is, from checking that they are not already on the list :-))? And exactly what media will I need? Should I test both 3.5" and 5.25" (I've not tried the 300/360 mod yet; I may do in the future, but for now I'd just like to get some testing done)? Anything to watch out for? Any particular version of DOS recommended (I have 6.2? kicking around, would FreeDOS do if that is easier to find)? Thanks Antonio