Rodime Plc

Sham P Bhatia

Alexander Stewart

Duncan S Furness

A fine position closed loop servo system is disclosed for magnetic disk storage media having a plurality of data storage disks in which a first servo burst is contained on the surface of one of the data storage disks, the servo burst data being spaced at radial positions one-half track displaced from each of the odd-numbered concentric track centerlines and a second servo burst signal is contained on the surface of another of the data storage disks, the second servo burst signal being recorded at radial positions one-half track displaced from the even-numbered concentric track centerlines. Both the first and second servo burst data are read simultaneously utilizing the data transducers associated with the surfaces of the respective data storage disks and the envelopes of each of the servo burst signals are simultaneously, separately detected. The envelope signals thus detected are compared in order to generate a position error signal which is applied to the head actuating mechanism of the disk drive in order to promote and maintain track centerline alignment of an enabled data transducer during operation of the magnetic disk storage means.

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Boca Raton, FL, United States of America

Sham P Bhatia