Hitachi, Ltd.

Noriaki Minamide

Yoshihiro Moribe

Osamu Beppu

Kiyotake Kumazawa

Mikio Takahashi

Masahiro Mitamura

A magnetic disc head positioning system using a stepper motor eliminates positioning errors due to different approach directions and distances to a target track position through a drive control of temporarily stopping the head at a position immediately preceding or following the target track depending on the approach direction and, thereafter, moving the head from this position to the target track with a constant transient response. The head is brought to the temporary stop position by utilizing the overshooting response of the stepper motor so as to minimize the positioning time.

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Odawara, Japan

Noriaki Minamide