Disk drive with servo synchronous recording

Details Disk drive with servo synchronous recording Disk drive with servo synchronous recording

2005-03-29

2005-03-29

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S077080

Reexamination Certificate

active

06873483

ABSTRACT:
A read clock circuit for a disk drive includes a phase-locked loop/voltage controlled oscillator (VFO/PLL) and a frequency synthesizer. The VFO/PLL receives a servo sector transition signal that is related to detected transitions in a servo sector field of a magnetic recording disk, and outputs a servo frequency signal that is synchronous to the servo sector transition signal. The frequency synthesizer receives the servo frequency signal and generates the read clock signal that is synchronous with the servo frequency signal. In a banded recording disk drive the frequency synthesizer generates a unique read clock signal for each data band.

REFERENCES:
patent: 4894734 (1990-01-01), Fischler et al.
patent: 5206847 (1993-04-01), Kanda
patent: 5253131 (1993-10-01), Chevalier
patent: 5535067 (1996-07-01), Rooke
patent: 6049438 (2000-04-01), Serrano et al.
patent: 6104563 (2000-08-01), Dovek et al.
patent: 20030043710 (2003-03-01), Shelton et al.
J.R. Pollock, “Method to Overcome the Problems of using Fixed Frequency Oscillator to Write Variable Length Data on DASD”, IBM Technical Disclosure Bulletin, vol. 38, No. 4, Apr. 1995, 283.
H. Yada, Clock Jitter in a Servo-Derived Clocking Scheme for Magnetic Disk Drives, IEEE Transactions on Magnetics, vol. 32, No. 4, Jul. 1996, 3283-3290.
H. Yada, et al., “External Clocking PRML Magnetic Recording Channel for Discrete Track Media”, IEEE Trans. Fundamentals, vol. E76-A, No. 7, Jul. 1993, 1164-1166.

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