Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1996-05-01
1997-04-29
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 53, G11B 2010
Patent
active
056255063
ABSTRACT:
A method and apparatus are provided for maintaining file readback performance compensating for readback errors caused by head/disk interaction used with a data detection channel in a direct access storage device. A readback signal is sensed from at least one disk surface and a data channel error rate is detected responsive to the readback signal. The detected data channel error rate is compared with a first predetermined threshold value and a gain of a phase lock loop (PLL) in the peak data detection channel is optimized responsive to an identified data channel error rate with a first predetermined threshold value. The PLL gain is adjusted until a lowest error rate is detected. A failure warning for the direct access storage device is provided to a user when the detected PLL gain is greater than a predefined loop gain value.
REFERENCES:
patent: 4003086 (1977-01-01), Larsen et al.
patent: 4394695 (1983-07-01), Mahor
patent: 4578721 (1986-03-01), Brannan, Sr.
patent: 4719523 (1988-01-01), Kutaragi
patent: 4726022 (1988-02-01), Chan et al.
patent: 4908722 (1990-03-01), Sonobe
patent: 4908812 (1990-03-01), Aoshima et al.
patent: 5045956 (1991-09-01), Ejima
patent: 5095470 (1992-03-01), Oka et al.
patent: 5121085 (1992-06-01), Brown
patent: 5146372 (1992-09-01), Cronch et al.
patent: 5168483 (1992-12-01), Oka et al.
patent: 5168484 (1992-12-01), Wachi et al.
patent: 5329251 (1994-07-01), Llewellyn
patent: 5404250 (1995-04-01), Hase et al.
patent: 5424883 (1995-06-01), Koren
Maurine et al, "Dynamic Fly Height Monitor," IBM Technical Disclosure Bulletin, vol. 28, No. 11, Apr. 1986, pp. 5133-35.
Abstracts of Japan vol. 16 No. 457, Information Reproducing Device, Seiichiro Satomura, Pub. No. 04-162263, Pub. date: Sep. 22, 1992.
Dovek Moris M.
Smith Gordon J.
Spong Jaquelin K.
Cullen Larry T.
International Business Machines - Corporation
Pennington Joan
Psitos Aristotelis
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