Hitachi Global Storage Technologies Netherlands B.v.

Kaoru Iseri

Fuminori Sai

Kenji Ogasawara

Hiroshi Yanagisawa

Takashi Kuroda

Nobuya Matsubara

Atsushi Tobari

Yasuhiro Iihara

Masanori Aratani

Embodiments of the invention avoid an off-track write when an impact is applied. A hard disk drive according to one embodiment of the present invention comprises a magnetic disk; an actuator for moving a head element section over the magnetic disk; and an HDC/MPU for prohibiting the head element section from writing onto the magnetic disk for a short period when a detected impact is found to be greater than a low reference level and not greater than a high reference level, and prohibiting the head element section from writing onto the magnetic disk for a period longer than the short period when the detected impact is found to be greater than the high reference level.

Data storage device and data storage device control method

A servo system wherein a read head R detects a servo pattern that is written on a magnetic disk by a write head W. Position control of the write head W is exercised in accordance with the detected servo pattern, and the read head R detects a propagation pattern that is written on the magnetic disk by the write head W. Position of the write head W is corrected in accordance with the detected propagation pattern.

Servo information write method, servo control method, data storage device, and program

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Kanagawa, Japan

Kaoru Iseri