Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-04-11
2006-04-11
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S048000
Reexamination Certificate
active
07027257
ABSTRACT:
A disk drive has a sampled servo system controller and a disk. The disk has a plurality a plurality servo burst fields, each including a first normal burst field, a first quadrature burst field, a second normal burst fields and a second quadrature burst field. A portion of the first quadrature burst field is circumferentially contiguous with the first normal burst field and spans a portion of a radial extent of the first normal burst field. The second normal burst field is radially aligned with and away from the first normal burst field and spans a portion of a radial extent of the first quadrature burst field. The second quadrature burst field is radially aligned with and away from the first quadrature burst field and spans a portion of a radial extent of the second normal burst field. The first normal burst field and the first quadrature burst field have a same first phase, the second normal burst field and the first quadrature burst field have a same second phase and the difference between the first phase and the second phase is less than 180 degrees.
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Abdullah Al Mamun, et al., “Disk Drive Having A Disk Including A Servo Burst Pattern In Which A Phase Difference Between Radially Adjacent Servo Bursts Is Less Than 180 Degrees” IEEE Industrial Electronics society.2001 pp 609-614.
Olson Jason
Prejean, Esq. Jonathan E.
Western Digital Technologies Inc.
Young, Esq. Alan W.
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