The
DEC RD51 is a re-branded Seagate ST-412 10MB
MFM disk.
It is supported by the following DEC QBUS MFM disk controllers::
4.3 BSD disktab
rd51|RD51|DEC RD51 Winchester:\
:ty=winchester:ns#18:nt#4:nc#300:\
:pa#15884:ba#4096:fa#512:\
:pb#5716:bb#4096:fb#512:\
:pc#21600:bc#4096:fc#512:
See also
RD51/52/53 Survival Tips