FW: RK05 question

From: Paul Koning <pkoning_at_equallogic.com>
Date: Tue Jul 13 08:58:43 2004

>>>>> "Fred" == Fred N van Kempen <waltje_at_pdp11.nl> writes:

 Fred> On Tue, 13 Jul 2004, Paul Koning wrote:
 David> the "home" slit and synthesize the individual sectors. Never
 David> tried this with an RK05 [heck havent touched one of them in
 David> over 25 years!], but I have used this technique to synchronize
 David> otgher items.....
>> I suppose that's possible. One way to do it would be to build a
>> PLL that's locked to the start of track pulse, and derive a 12x or
>> 16x sector clock from that. Or, analogously, you could use a PLL
>> to derive a 16 sector clock from the 12 sector clock (multiple by
>> 4/3rd, not hard with a PLL). That's probably a good solution...

 Fred> Hm, and then ignore the "real" sector pulses and feeding the
 Fred> drive electronics the output of the PLL? Smart, that should
 Fred> work, assuming one can format the packs given this "sector
 Fred> clock".

Yes, that's what I had in mind -- hook the optical sensor to the PLL,
feed the PLL output to where the sensor used to go. The one obvious
tricky part is to generate the track index pulse, because it isn't
equally spaced along with the sector pulses.

 Fred> Would these then be called hard- or soft-sectored? :)

Firm-sectored? :-)

        paul
Received on Tue Jul 13 2004 - 08:58:43 BST