Control of Termal Off-Tack Compensation System of a Magnetic Disk Drive with Fine Head Positioning Mechanism.

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  • ヘッド微動機構を用いた磁気ディスク装置熱オフトラック補正システムの制御
  • ヘッド ビドウ キコウ オ モチイタ ジキ ディスク ソウチ ネツ オフ トラ

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Abstract

A thermal off-track compensation system for a dedicated-servo-type magnetic disk drive with a piezoelectric fine head positioning mechanism has been developed. It measures the amount of the off-track displacement of each head at the reference cylinder whose tracks on data surfaces have position information. If the off-track displacement exceeds the limit, it is compensated by displacement of the piezoelectric fine head positioning mechanism. The piezoelectric actuator is driven along a predetermined voltage trajectory with regard to its calibration curve in order to be free from the hysteresis effect. Heat-run tests show that the system effectively suppresses the thermal off-track displacement.

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