Nice list, Johnny.
RX drives aren't "hard" drives, of course.
Then there's one old one missing from the list: the RS64 (RC11
controller), capacity 64 kbytes. It was supported by DOS, and (as a
swapping disk only) by older versions of RSTS. It was *not* supported
by RT11 -- I was told "because there weren't any left when we were
developing RT11" -- in other words, they were basically obsolete in
1974... (I did create an RT driver for it, which was tricky because
of the 64 byte sector size.)
paul