Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-09-22
2008-12-16
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07466509
ABSTRACT:
A disk drive operable with first and second servo patterns in a perpendicular media recording (PMR) environment is disclosed. The disk drive comprises a head operable with a perpendicular flux, a disk, and a servo controller. The disk includes a plurality of tracks, wherein each track has a plurality of servo sectors utilized in seek operations. The servo sectors of the disk include a first servo pattern between one of an inner diameter (ID) or an outer diameter (OD) of the disk and a middle diameter (MD) of the disk, respectively, and a second servo pattern between the other of the OD or the ID of the disk and the MD of the disk, respectively. The servo controller operates in a first mode when seeking within one of the first or second servo patterns and a second mode when seeking between the first servo pattern and the second servo pattern.
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Office Action dated Sep. 21, 2007 from U.S. Appl. No. 11/525,411, 6 pages.
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Chen Teddy T. C.
Jang Jinsheng Bill
Nguyen Jonathan V
Yu Jie
Blakely & Sokoloff, Taylor & Zafman
Tzeng Fred
Western Digital Technologies Inc.
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