Method and apparatus for offset control in a disk drive

Details Method and apparatus for offset control in a disk drive Method and apparatus for offset control in a disk drive

2011-01-18

2011-01-18

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077040, C360S077080, C360S078040

Reexamination Certificate

active

07872829

ABSTRACT:
According to one embodiment, there is provided a disk drive that can perform dynamic offset control (DOC). The disk drive has a magnetic head, a disk, and offset calculating modules. The magnetic head has read head. Offset-measuring position data is written in a non-servo area provided in the disk. The read head reads the offset-measuring position data from the disk. Based on the offset-measuring position data thus read, the offset calculating modules calculate an offset value that changes during a one-rotation period of the disk.

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Notice of Reasons For Rejection mailed by Japan Patent Office on Jun. 30, 2009 in the corresponding Japanese patent application No. 2008-304835.

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