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Tatsuro Sasamoto

Fujitsu

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asia pacific magnetic recording conference | 2000

Acceleration feedforward control against rotational disturbance in hard disk drives

Akihide Jinzenji; Tatsuro Sasamoto; Koichi Aikawa; Susumu Yoshida; Keiji Aruga

We have developed a hard disk drive (HDD) free of rotational disturbance using dual piezoelectric accelerometers. The dual accelerometers detect angular acceleration in the HDD and compensate for its negative effects. For optimum compensation we introduced the use of an optimal phase compensation filter (PCF). Using this controller, HDD performance does not decrease even under the severest conditions: for example, in a disk array system that has the severest mechanical interaction between HDDs.

Archive | 2001

Disk device conducting a disturbance compensation based on a time-interval measurement in reading servo sectors recorded on a disk

Koichi Aikawa; Tatsuro Sasamoto; Akihide Jinzenji

Archive | 2000

Servo information writing method and storage device

Tatsuro Sasamoto; Masakazu Hirano

Archive | 1995

Method of controlling a start-up of a motor used for a disk apparatus

Kazuo Nishimura; Tatsuro Sasamoto

Archive | 2000

Disk drive unit and control method for same

Koichi Aikawa; Tatsuro Sasamoto; Susumu Yoshida; Akihide Jinzenji

Archive | 1994

Magnetic disk apparatus, recording medium, and accessing method for performing constant density recording

Kazuo Nishimura; Tatsuro Sasamoto; Hideaki Tanaka; Hiroaki Etoh

Archive | 1997

Servo pattern writing method for magnetic disk drives, and magnetic disk drive adopting the method

Tatsuro Sasamoto; Isamu Tomita; Keiji Aruga

Archive | 1996

Disk apparatus for controlling a seek operation of a read/write head to a target location of a recording disk

Tatsuro Sasamoto; Hideyuki Watanabe

Archive | 1990

HEAD EXCHANGE SYSTEM FOR DISC DRIVE SYSTEM CONTROLLING BUSY SIGNALS IN ACCORDANCE WITH HEAD OFFSET

Tatsuro Sasamoto; Masamichi Suzuki

Archive | 1993

Magnetic disk apparatus with improved positioning control of magnetic head

Tatsuro Sasamoto; Kazunori Mori

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Kazunori Mori

Fujitsu

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Koichi Aikawa

Fujitsu

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Akihide Jinzenji

Fujitsu

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Isamu Tomita

Fujitsu

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Susumu Yoshida

Fujitsu

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Kazuo Nishimura

Fujitsu

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Keiji Aruga

Fujitsu

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Masamichi Suzuki

Fujitsu

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Hideaki Tanaka

Fujitsu

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Hiroaki Etoh

Fujitsu

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