Help needed identifying old MFM drives from the excavation

Chuck Guzis cclist at
Mon Dec 7 11:00:51 CST 2020

On 12/7/20 8:21 AM, Bill Gunshannon via cctalk wrote:
> On 12/6/20 10:39 PM, Josh Dersch via cctalk wrote:
>> Yeah, the later models used 5.25" media; the rare PERQ 2 used 8"
>> Micropolis
>> drives, and the PERQ 1/1A used 14" Shugart SA-4000 drives.
> Wow. 14"!!  last time I saw one of those was on the Apollo that used
> to warm my house in the winter time.

Got an SA4006 sitting here in the shop with an IEEE-488 controller (done
in SSI--the PCB has the same footprint as the drive).  Haven't powered
it up in about a decade, but it was working the last time I tried.

You really missed out on the big disk drives, say, the old Bryant
monsters with their 8 pound head assemblies and hydraulic leak bottles.

For a long time, the CDC 808 disk drive was standard fare on CDC 6000--4
spindles spinning stacks of what must have been 30" disks, using an
array of 6-bit parallel heads.  About 7 feet tall and very reliable.


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