Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Reexamination Certificate
2007-03-20
2007-03-20
Dinh, Tan (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
C360S075000
Reexamination Certificate
active
10840819
ABSTRACT:
A data recording medium has tracks with pseudo-noise (PN) sequences with good autocorrelation properties as servo information for controlling the position of the recording head. A first set of alternating tracks uses a leading pseudo-random binary sequence (PRBS), which is a PN sequence with good autocorrelation properties, and a following PRBS that is cyclically shifted from the leading PRBS. A second set of alternating tracks interleaved with the first set also has a leading PRBS and a following PRBS that is cyclically shifted from the leading PRBS, but the leading PRBS in each of the tracks in the second set is offset along-the-track from the leading PRBS in the tracks of the first set. The head positioning control system uses the leading PRBS to generate a servo timing mark (STM), the cyclic shift to generate track identification (TID), and the following PRBS from adjacent tracks to generate the head position error signal (PES).
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MacWilliams and Sloane, Proceedings of the IEEE, vol. 64, No. 12, pp. 1715-1729.
Coker Jonathan Darrel
Flynn David Timothy
Galbraith Richard Leo
Berthold Thomas R.
Davidson Dan I
Dinh Tan
Hitachi Global Storage Technologies - Netherlands B.V.
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