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Demodulation of servo tracking signals printed with a lithographically patterned master disk

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4 Author(s)
T. Ishida ; HD Dev. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan ; K. Miyata ; N. Komura ; T. Takaoka

Demodulation of the servo tracking signals magnetically printed on hard disks by using a lithographically patterned master disk has been studied. Position signal decoded from the printed servo pattern was successfully demonstrated on a spin stand. Position error evaluated in a prototype drive was 30% track pitch. Pulse timing shift control by compensating the pattern dimension, and introduction of a more sophisticated servo control system for actively controlling the printed pattern eccentricity would be key issues for further improvements

Published in:

IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 4 )