| 摘要 |
<p>In a magnetic disc apparatus off-track quantities are stored corresponding to circular reference servo tracks formed in divided data areas on a magnetic disc (1) and, when positioning a magnetic head (3), the head (3) is shifted in dependence on the stored off-track quantity after having first been positioned by a head position detector (2, 5). Gradients of the variation in the off-track quantities with the temperature of the apparatus may be previously stored and, after the actual temperature has been detected by means of a temperature sensor (20), the off-track quantity relative to the reference servo track may then be corrected in accordance with the gradient of the off-track quantity for the relevant track at the detected temperature, whereby accurate tracking is achieved.</p> |
