Hitachi Global Storage Technologies Netherlands B.v.

Shuhsuke Kurihara

Hiroshi Uchiike

Kenji Ogasawara

Yuhji Takagi

Embodiments of the invention provide techniques to inspect the track pitch of a magnetic disk. In one embodiment, the track pitch is inspected using the servo information that was written onto the magnetic disk. A PES gain is set to be PGA head is moved to a position K near the position where control is to switch between MPES and SPES, and then MPES and SPES are calculated using reproduced burst signals and PGThe quantity of change in the inspection HSP which is a half-servo pitch of an inspection-related burst pattern, with respect to an ideal half-servo pitch, is detected by calculating PES&#x394;, the difference between the MPES and SPES at position K. The track pitch is thus judged whether it is abnormal.

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Kanagawa, Japan

Shuhsuke Kurihara