Help needed identifying old MFM drives from the excavation

Jon Elson elson at
Mon Dec 7 21:07:42 CST 2020

On 12/07/2020 03:45 PM, Tom Owad via cctalk wrote:
> I have a Bryant platter on the wall of my office, but I’m 
> not old enough to have seen it operational. 39” diameter, 
> 1/4” thick, made of magnesium. It came out of Collins 
> Radio Company in Cedar Rapids, IA.
I have a 30" platter from an old accounting machine.  I 
think it had 64 fixed heads.  I did some experiments with it 
but decided the data capacity was so low that it was not 
worth spending time trying to cobble up a controller.  it is 
possible the data rate could be increased quite a bit, but 
maybe the heads flew so high, or had such wide gaps that it 
couldn't be pushed.


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