Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Douglas W. Johnson0
Denis J. Langlois0
Date of Patent
May 27, 2008
Patent Application Number
11171958
Date Filed
June 29, 2005
Patent Primary Examiner
Patent 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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