Tracking error corrected magnetic disc apparatus

Details Tracking error corrected magnetic disc apparatus Tracking error corrected magnetic disc apparatus

G - Physics

11

B

352/21.32

G11B 5/596 (2006.01) G11B 21/10 (2006.01)

Patent

CA 1333938

A magnetic disc apparatus wherein off-track quantities are stored with regard to reference servo tracks formed circularly in divided data areas on a magnetic disc and, at the time to displace a magnetic head, the head is shifted an extent of the stored off- track quantity after being once positioned by a head position detector. Gradients of the off-track quantities to tracks at individual temperatures in the apparatus are previously stored and, after the actual temperature is detected by means of a temperature sensor, the off-track quantity relative to the reference servo track is corrected in accordance with the gradient of the off- track quantity to the relevant track at the detected temperature, whereby just tracking is achieved. The magnetic head can be positioned exactly with respect to a desired data track while the head displacement time is shortened. Furthermore, data can be written in the entire length of each circular data track to enhance the effi- ciency of utilizing the magnetic disc, and high-precision tracking is attainable with the off-track quantity reduced to zero in any data track.

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