On Wed, Mar 31, 2004 at 12:45:12AM -0800, Vintage Computer Festival wrote:
> On Wed, 31 Mar 2004, Ethan Dicks wrote:
>
> > On Tue, Mar 30, 2004 at 01:00:21PM -0800, Tom Jennings wrote:
> > > 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.
> >
> > Sounds a bit like the DEC DF-32 - 1/4" steel platters plated with something
> > (nickel?) The drive motor has a seperate power switch from the electronics,
>
> The Librascope L321 fixed-head drive I've got is coated with cobalt
> according to the literature.
My anecdotal evidence is that the DF-32 disk is Omsmium plated. I hope not,
as I have four platters with, probably, fatal levels of restarting, meaning
that if I ever want to return them to service, I'll have to either replace
or replate the platters.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 31-Mar-2004 13:01 Z
South Pole Station
PSC 468 Box 400 Temp -77 F (-60.6 C) Windchill -136.3 F (-93.5 C)
APO AP 96598 Wind 13.2 kts Grid 006 Barometer 677.1 mb (10735. ft)
Ethan.Dicks_at_amanda.spole.gov http://penguincentral.com/penguincentral.html
Received on Wed Mar 31 2004 - 07:08:20 BST