Magnetic disc apparatus

Details Magnetic disc apparatus Magnetic disc apparatus

1989-10-25

1993-03-23

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 65, 360 7704, 360 7707, 360135, G11B 5596

Patent

active

051969700

ABSTRACT:
A magnetic disc apparatus having at least one magnetic disc having a plurality of track groups thereon at different distances from the center of the disc each of which groups comprises plural data tracks having plural data sectors, each of the track groups having a different number of the data sectors therein in such a manner that the outer track group has more data sectors, a transducer head for reading and writing data signals from and on the data tracks, an actuator for positioning the transducer head over a desired one of the data tracks, a position sensor for sensing the position of the transducer head relative to the magnetic disc, and for generating at least two periodic position signals each of which is out of phase with each other, and a controller for controlling the actuator according to the periodic position signals so that the transducer head is positioned over the desired one of the data tracks.

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A. Paton, Correction of Data Track Misregistration in Servo Controlled Disk Files, IBM Technical Disclosure Bulletin, vol. 17, No. 6, Nov. 1974, pp. 1781-1783.

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