Kabushiki Kaisha Toshiba

Takuji Shimada

Hideo Sado

Masahide Yatsu

Seiji Mizukoshi

Yuichi Notake

Takayuki Matsuzaki

Katsuki Ueda

According to one embodiment, in a disk drive having a disk medium on which servo data is recorded, servo-write management information is recorded on the disk medium, in the form of binary data based on the 0 or 180 degrees out of phase pattern composed of the servo burst signals included in the servo data and being out of phase. The disk drive includes a servo-data reproducing unit that reproduces the servo-data and the servo-write management information.

Method and apparatus for writing servo management information in a disk drive

According to one embodiment, a servo information writing method for use in a disk drive, for recording the servo information, forming a continuous servo track such as a spiral track. In this servo information writing method, the head is stopped when a write error is detected while the servo information is being written, and the head is then moved again at a constant speed and starts writing the servo information again, at the position where the write error has occurred.

Method and apparatus for correcting errors while writing spiral servo information in a disk drive

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Ome, Japan

Takuji Shimada