Data recording medium with servo pattern having pseudo-noise...

Details Data recording medium with servo pattern having pseudo-noise... Data recording medium with servo pattern having pseudo-noise...

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).

REFERENCES:
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patent: 6288860 (2001-09-01), Buch
patent: 6967808 (2005-11-01), Bandic et al.
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patent: 7003674 (2006-02-01), Hamlin
MacWilliams and Sloane, Proceedings of the IEEE, vol. 64, No. 12, pp. 1715-1729.

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