Position mode track seek servo for high capacity disk drive syst

Details Position mode track seek servo for high capacity disk drive syst Position mode track seek servo for high capacity disk drive syst

1989-05-26

1990-11-20

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, G11B 2110

Patent

active

049723502

ABSTRACT:
During the arrival phase of long seeks, e.g. the last six tracks of a seek, and during the entirety of relatively short seeks, e.g. seeks of less than 256 tracks, position mode servo control is employed by locking an actual tracking error feedback signal to a microprocessor-synthesized reference tracking error signal. The position mode servo feedback loop employs a parallel combination of a synchronous demodulator and a phase-frequency detector to achieve good locking performance over the entire frequency spectrum of the synthesized reference tracking error signal.

REFERENCES:
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4627038 (1986-12-01), Abed et al.
patent: 4627039 (1986-12-01), Meyer
patent: 4745587 (1988-05-01), Maeda et al.
patent: 4858214 (1989-08-01), Baba

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