Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2011-07-26
2011-07-26
Negrón, Daniell L (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S048000
Reexamination Certificate
active
07986488
ABSTRACT:
A magnetic recording disk drive has a position-error-signal (PES) servo pattern divided into at least two circumferentially adjacent fields that extend radially across the data tracks and include PES blocks that are DC magnetized in one direction, with each PES block having a magnetization opposite to the magnetization of its radially adjacent neighboring PES blocks. Each PES field is contiguous with and shifted radially relative to its circumferentially adjacent neighbor PES fields. Each PES block has a single DC magnetization, and the length of the magnetization is substantially longer than the length of the magnetizations in the other fields of the servo pattern.
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Coker Jonathan Darrel
Flynn David Timothy
Haugen Joel Dale
Krishnaswamy Neil
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
Negrón Daniell L
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