Hard disk drive employing a reference track to compensate for tr

Details Hard disk drive employing a reference track to compensate for tr Hard disk drive employing a reference track to compensate for tr

1987-08-04

1990-11-27

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77030, 360 77040, 360 78110, G11B 5596

Patent

active

049741098

ABSTRACT:
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 of displacing the 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 corresponding 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 efficiency 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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IBM TDB, vol. 19, No. 6, "Self Calibrating Disk Storage Apparatus" Griffiths et al. 11/76, pp. 1991-1992.

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