19 Dec
2025
19 Dec
'25
4:15 a.m.
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.)
19 Dec
19 Dec
6:25 a.m.
New subject: IBM 2315 Cartridges
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 <cctalk(a)classiccmp.org>
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.)
4:51 p.m.
New subject: IBM 2315 Cartridges
On 12/18/25 21:15, brian--- via cctalk wrote:
Yes, Diablo made a one-fixed, one cartridge drive.
Jon
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.)
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brian＠quarterbyte.com -
Jon Elson -
Nadav Eiron