working magnetic drum stores?

From: Tony Duell <>
Date: Tue Mar 30 17:31:38 2004

> LGP-21 fixed-head-platter mechanical memory (main store,
> not "disk") the heads sit crashed (sic) and lift when up to
> speed. The platter surface has fine scoring -- it's normal. It's
> only 80 bits per inch. Nickel plated steel. In fact, there's
> little springs that press the heads DOWNWARD.

FWIW, the springs on hard disk heads press the heads _towards_ the
platter too. Look at something like an RK05 sometime. The heads are
lifted by flying on the air dragged round by the platter.

Received on Tue Mar 30 2004 - 17:31:38 BST

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