[vcf-midatlantic] Drive repairs, was Hard drive art

David Gesswein djg at pdp8online.com
Thu Apr 18 22:34:34 EDT 2019

On Thu, Apr 18, 2019 at 10:24:47PM -0400, Dave McGuire via vcf-midatlantic wrote:
>   But if we're rewriting the servo tracks anyway, it won't matter,
> unless we're trying to recreate them to align to existing data.
> Otherwise they can be anywhere, and the other tracks will follow suit
> when the drive is low-level formatted.

If its a voice coil servo drive I'm not sure how you would get the track at 
uniform spacing without some sort of measurement and feedback.

>   I guess the question is whether we'd do this to recover the
> functionality of a drive or recover the data from a drive.

I've heard of the degaussing to erase packs problem. I haven't seen
bad servo tracks as the reading problem. Is normally some mechanical shift
so when the servo has the servo head centered some of the heads aren't
on track. Pulling the servo loop method I linked to in the first posting is 
the easier way to recover the data. I also had tracking problem when I did a
board swap to recover a drive. The replacement board servo null was
physically off from the original.

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