Hitachi Global Storage Technologies Netherlands B.v.

International Business Machines Corporation

Hirofumi Yanase

Kenji Ogasawara

Nobuyuki Kitazaki

Masaomi Ikeda

Manabu Saikawa

Atsushi Takeichi

Michiharu Saitoh

Masashi Murayama

Provided is a data storage device in which read and write heads can be desirably located with respect to servo tracks from the viewpoint of linearity of a PES on the premise that a read write offset exists. A read write offset value, which is a deviation amount between write and read heads in a radial direction of a disk-shaped storage medium, is set equivalent to an integer number N of servo tracks.

Data storage device and servo information writing method

The read/write offset between the read head and write head is used to determine the head width ratio between the read head width and write head width. The servo information is written onto the magnetic disk in accordance with the APC value and track pitch that are derived from the determined head with ratio.

Servo information write method, data storage device, and programs

Provided is a data storage device in which servo track pitch varies within a predetermined region in a radial direction of a disk-shaped storage medium.

Disclosed is a data storage device to provide servo patterns of a track pitch individually consistent with head characteristics (writing width, and reading width) in a recording medium of a hard disk device. The data storage device is provided with a disk having pitch information indicating a track pitch recorded in a predetermined area, and a head for scanning the disk to read the TPI ID and reading/writing data from/in the disk by being subjected to seeking control based on the TPI ID. The TPI ID is recorded as a part of a servo pattern in a TPI ID embedded area provided in an outer periphery of a data area of the disk.

Data storage device, recording medium, servo writing method, and data reading/writing method

The invention relates to a method for writing servo patterns on a data recording disk of a disk drive device. A read/write head is stopped at a reference position on the data recording disk, then the read/write head is moved along a radial direction of the data recording disk from the reference position, then a determination is made as to whether the data recording disk has a sufficient width along the radial direction to write a predetermined number of servo tracks, or not, then the servo patterns are written on the servo tracks if the data recording a disk has the sufficient width.

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Fujisawa, Japan

Hirofumi Yanase