I have such a drive connected to an 11/45. It's branded as Plessey. The drives are double density RK05 compatible (i.e., it's like an RK05F + a "removable RK05F" with a specially marked removable pack that looks physically like an RK05 pack) and present as 4 RK05 drives to the controller - two on the fixed platter and two on the removable one. Haven't had the time to try and get them to work yet, but such a device does exist.
On Thu, Dec 18, 2025 at 7:16 PM brian--- via cctalk <[email protected]> wrote: > > No. The only DEC drive that had removable plus fixed on the same spindle > > was the RC25. > > > > If I remember correctly it was Diablo that sold an RK05-compatible drive > with one fixed platter and one removable cartridge. I encountered it on a > PDP 11/34 running Mini Unix and then, hmmm, Unix v<something small>. (Or > maybe had to move to a larger disk system when we moved up from Mini Unix. > The details have gotten hazy.) >
