Hitachi, Ltd.

Sinji Mizunuma

Shigemitsu Higuchi

Masayoshi Sunada

A magnetic storage disk tracking system employing a stepping motor is operable to compensate the tracking error within a certain expected range caused by the hysteretic movement of the motor. The system incorporates means for recognizing the track to which the magnetic head is positioned and memory means in which is stored data for compensating the positioning error depending on each track. The stepping motor is controlled through the excitation voltage of each winding under modulation in terms of the magnitude or duty cycle in compliance with the stored data.

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Hitachi, Japan

Sinji Mizunuma