Method for inspecting track pitch in a magnetic disk

Details Method for inspecting track pitch in a magnetic disk Method for inspecting track pitch in a magnetic disk

2007-07-10

2007-07-10

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000

Reexamination Certificate

active

11193942

ABSTRACT:
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 PG0.A 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 PG0.The 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 PESΔ, the difference between the MPES and SPES at position K. The track pitch is thus judged whether it is abnormal.

REFERENCES:
patent: 6181504 (2001-01-01), Ahn
patent: 6369974 (2002-04-01), Asgari et al.
patent: 6751042 (2004-06-01), Bi et al.
patent: 7023637 (2006-04-01), Kupferman
patent: 2005/0168858 (2005-08-01), Lee et al.
patent: 07-153212 (1995-06-01), None

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