On Thu, 19 Mar 1998, Tony Duell wrote:
> > Since the late 60's, most servo-writing equipment uses laser interferometers
> > to lay down the tracks. "Special" certainly *is* the operative word
> > here!
>
> I'd realised it wasn't a mechanical stepper motor (nowhere near accurate
> enough), but I'd not realised that it was a laser interferometer. Ouch!
>
> I'm suprised it has to be _that_ accurate, since surely minor errors in
> track position would be compensated for by the servo system of the drive.
> But I guess the makers know what they are doing.
>
> >
> > Tim.
> >
>
> -tony
Probably more related to track density which is now well in excess of
2000tpi!
- don
donm_at_cts.com
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
Chairman, Dina-SIG of the San Diego Computer Society
Clinging tenaciously to the trailing edge of technology.
Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*
see old system support at
http://www.psyber.com/~tcj
visit the "Unofficial" CP/M Weg site at
http://cdl.uta.edu/cpm
with Mirror at
http://www.mathcs.emory.edu/~cfs/cpm
Received on Fri Mar 20 1998 - 13:20:16 GMT