how fast were drum memories?

Jon Elson elson at
Thu May 10 11:12:01 CDT 2018

On 05/10/2018 09:57 AM, Chuck Guzis via cctalk wrote:
> Jim Thornton and folks at CDC ADL were working on a 100K 
> RPM drum spinning in vacuo for a paging store, but they 
> couldn't get it to work reliably.
Anything with high bit density needs to have the heads very 
close to the data surface.  With the heads close, you really 
need to have aerodynamic flying heads to compensate for 
thermal and other variations in the mechanical system.  So, 
I really have doubts the evacuated drum is going to work.


More information about the cctech mailing list