working magnetic drum stores?

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
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.

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