Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Reexamination Certificate
2008-05-27
2008-05-27
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
C360S077120
Reexamination Certificate
active
11171958
ABSTRACT:
The invention is directed to a servo frame that includes servo windows written with different frequencies to provide redundant positioning information. The servo frame includes a set of first servo windows recorded at a first frequency and a set of second servo windows recorded at a second frequency arranged in a checkerboard-like pattern. The different frequencies of the servo windows allow the servo frame to achieve improved positioning information redundancy. A servo track may include a plurality of the servo frames described herein to accurately position data read/write heads adjacent corresponding data tracks. The redundancy built into each of the servo frames substantially minimizes errors in the positioning information.
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Johnson Douglas W.
Langlois Denis J.
Imation Corp.
Kapadia Varsha A
Levinson Eric D.
Wellington Andrea
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