RK06 alignment pack
jonelson126 at gmail.com
Wed Jun 17 22:02:02 CDT 2015
On 06/17/2015 11:56 AM, Johnny Billquist wrote:
> On 2015-06-17 18:36, Pontus Pihlgren wrote:
>> How was alignment packs produced?
> As far as I know, in special machines mounted on slabs on stone
> weighting tons, standing on dampeners, so that you had absolutely
> vibration free environment, and then a very precisely controlled head
> control system that could write the tracks at the exact place they
> should be. I think the alingment packs even have some tracks
> intentionally offset from true center in order to check signal
> strength when heads are slightly off track as well.
These pack formatters used air bearings to give the most vibration-free
rotation of the spindle.
They were generally pretty open units, not like disk drives, and were
run in clean rooms by people wearing low-dust overalls.
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