I presume that
is a typo and it really is an FD-55B. Is it terminated?
I wouldn't bet on it. There is an FD-54B. That Sanyo MBC555 MS-DOS
machine has a couple of them in it (or at least mine does). I have no
idea what the difference between the FD-54B and the FD-55B is, though.
Have a likely-dead one of those drives laying around,
should anyone be interested...