Disk drive that compensates for phase incoherence between...

Details Disk drive that compensates for phase incoherence between... Disk drive that compensates for phase incoherence between...

2008-04-22

2008-04-22

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000

Reexamination Certificate

active

11440623

ABSTRACT:
Methods of compensating for radial incoherence in servo information that is read from adjacent servo tracks that have a phase offset relative to one another on a data storage disk of a disk drive are provided. While a transducer is seeking to a target track, the transducer generate a servo information signal that has a first component from servo information read from a first servo track on the disk and a second component from servo information read from a second servo track that is radially adjacent to the first servo track. The servo information in the first and second servo tracks are offset by a non-zero phase error relative to one another and are in a same servo sector on the disk. The servo information signal is sampled to generate a series of sampled servo values. A phase error of a group of the sampled servo values is determined. The sampled servo values are compensated in response to the determined phase error to generate compensated servo values with at least reduced phase error.

REFERENCES:
patent: 5301072 (1994-04-01), Wilson
patent: 6452990 (2002-09-01), Leis et al.
patent: 6738205 (2004-05-01), Moran et al.

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