From: Tony Duell <ard_at_odin.phy.bris.ac.uk>
Date: Mon Nov 10 11:33:51 1997

On Mon, 10 Nov 1997, Tim Shoppa wrote:
[track 0 sensor]

> It's most likely the optical sensor, especially if it's been in
> storage for a long while. Dust simply accumulates in the little
> light paths.

On all the track00 sensors that I've seen, the light is blocked when the
head is at track 0. So dust in the sensor would make the drive think it
was always at track 0, not that it hadn't got there. Wouldn't tyhe
controller then either not do anything on a restore or move the heads
towards the spindle in an attempt to get them off track 0?

I guess it depends on whether subsequent logic is edge or level triggered.
I see no reason to make it the former, but you never know.

Still blowing dust out of the sensor can't do any harm, and it's something
that I'd do first anyway, as it can't help the problem.

> Tim. (shoppa_at_triumf.ca)

Received on Mon Nov 10 1997 - 11:33:51 GMT

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