Alps Electric Co., Ltd.

Toru Kaneko

Hiroshi Yoshida

Yasushi Katanuma

Takashi Yamano

Michiko Kumagai

Hideyasu Takemura

A hard disk driving device in which a plurality of hard disks each formed with a magnetic recording layer are secured to the same rotational shaft in a predetermined spaced relation, and a magnetic head mounted on a floating (flying) type head slider is disposed on each surface, characterized in that an area of a portion concerned with flotation of a head slider provided on a head slider assembly sandwiched between adjacent hard disks is made to be smaller than an area of a portion concerned with flotation of a head slider provided on a head slider assembly sandwiched between adjacent hard disks.

Hard disk driving device having a plurality of head sliders with

A servo control apparatus which can accurately control the head with a simplified structure has a voltage controlled oscillator which is controlled in accordance with servo information stored in a servo data region of the disk, and a reversible counter which counts an output signal of the voltage controlled oscillator to convert it to a digital signal corresponding to the amount of deviation of the head from a target track. The digital signal is used for position control for accurate positioning of the head.

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Sendai, Japan

Toru Kaneko