PDP-11/45 RSTS/E boot problem
cisin at xenosoft.com
Mon Feb 18 15:16:02 CST 2019
On Mon, 18 Feb 2019, Liam Proven via cctalk wrote:
> Well that is the thing, of course. I had that with one old IDE disk,
> too. It made a terrible ear-piercing high whine that I associate with
> a failing disk... but it passed every diagnostic I could throw at it,
> so I used it for non-critical stuff and in testbed machines.
One of the moxt common causes of a terrible ear-piercing high whine is the
spindle contact. Many old drives had a springy piece that rubbed against
the end of the spindle. Over time, it would wear a divot, polish that,
and start to squeal. A very light pressure on it would test that
hypothesis. Not enough pressure to muffle the sound, and certaianly not
enough pressure to slow the spindle! Or, pulling up on it, away from the
spindle. Some people claimed that you could just rip it off. Don't.
Best is to twist it very slightly sideways, so that it can start wearing a
> My experience is extensive enough that _anyone's_ justifications of
> why they won't use Brand X disks get ignored,
Well, there don't seem to be many 350 RAMAC disks still running.
(I'm trying to decide what to use as a base to make a patio table out of a
[crashed] RAMAC 24" platter)
Grumpy Ol' Fred cisin at xenosoft.com
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