Alps Electric Co., Ltd.

Toru Kowaguchi

Tooru Kaneko

Shoichiro Saito

Motohiro Shimaoka

Isao Asano

Hiroshi Yoshida

Tomoo Iizumi

Jun Ide

Tetsuya Mitsuishi

Yasuyuki Hirose

A method of re-correcting the position of a head is used in a disk driving device including a zero track restoring arrangement for electrically detecting the zero track position on a magnetic disk, and including a track counter indicating the track position of the magnetic head. The method is configured to monitor the track number of the track counter and never fails to effect re-correction of the position of the head when the track number is '0' or '1'.

Method for recorrecting head position in a disk drive

An information recording disk driving device includes an information recording disk having servo tracks formed at predetermined regions which include servo information. The driving device is configured to move a head assembly from a recording track for signal writing or reading to an associated one of the servo tracks in response to a servo information supplied at a predetermined time. An instruction from a controller or an instruction from a host computer to read the servo information from the servo track subsequently place the head assembly at the fine track position of the original recording track according to the detected servo information.

Method of controlling a disk head position by individually timing zones

A disc drive apparatus for use in recording data on a flexible magnetic disc and/or reproducing data recorded on such a disc, has small dimensions and is capable of being manufactured at a low cost. This apparatus includes structures for preventing a disc and the read/write head from colliding when the disc is inserted into the apparatus. In addition, the apparatus permits two discs to be rotated simultaneously by one drive motor and one carriage carrying two head mechanisms is moved by one step motor.

Drive apparatus for flexible magnetic discs

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Furukawa, Japan

Toru Kowaguchi