how fast were drum memories?
cclist at sydex.com
Thu May 10 09:57:32 CDT 2018
On 05/10/2018 07:29 AM, Paul Koning via cctalk wrote:
> I'm wondering what the reality of fast drum memories looked like, and whether anyone came even close to these numbers. Also, am I right in thinking they are at least in principle achievable? I know I could run the stress numbers, but haven't done so.
All of the STAR-100 stations, including the paging station used drums.
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. At any rate, STAR was the last system I saw fast drums on
and you can check the figures in the Bitsavers documentation under
cdc/cyber/cyber200. At any rate, a head-per-track drum could be much
faster than a disk.
There were big slow drums, also. Consider the Univac FASTRAND unit.
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