| 摘要 |
PURPOSE:To control position of read heads at a high speed with high precision by using servo signals taken out from servo sectors on plural magnetic recording faces to adjust positions of heads. CONSTITUTION:An index hole 13 generates an index signal when passing an index detector 14 in accordance with rotation of a magnetic disk driving motor 15, and an index timer 31 performs head switching in a position control preamplifier 21 by this signal. The servo signal of the servo sector is amplified by an amplifier 23 and is outputted and has the peak detected by a peak detecting circuit 25 and is sampled and held by sampling and holding circuits 29 and 30 and is digitized by an A/D converter 32. This signal is taken into a microprocessor 33 to calculate the extent of center deviation and that of position deviation, and a digital value correcting them is calculated and is outputted to a D/A converter 34. The analog value of the converter 34 is supplied to a driving circuit 35 to correct the head to an optimum position.
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