Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-02-07
2006-02-07
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S048000, C360S077080, C360S078140
Reexamination Certificate
active
06995938
ABSTRACT:
A data recording system uses a recording medium in which the tracks have 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:
patent: 4831465 (1989-05-01), Pinson
patent: 5253131 (1993-10-01), Chevalier
patent: 6288860 (2001-09-01), Buch
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.
Habermehl James L
Hitachi Global Storage Technologies - Netherlands B.V.
Hudspeth David
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