I've stuck my RX02/RXV21 into my microvax and used it. However, I prefer
the DSD880 subsystems, as they have formatting built into the front panel
and firmware. I also prefer to run RT-11 to do all the fooling around,
not VMS/Unix/RSX/RSTS,etc. If I recall, the DSD box or the SMS/Qualogy
boxes used the standard 850/851 drives. I haven't powered up the DSD
440 floppy subsystem I have, but I'll bet that does both/all three
densities.
I have some OLD 8 inch IBM drives in external boxes. Never opened them.
If you want to try one in the project, let me know, you can have one.
No idea of the model or if they are single density. I'll pop one open
if you want.
Joe Heck