Method of apparatus for detecting defects in data apparatus such

Details Method of apparatus for detecting defects in data apparatus such Method of apparatus for detecting defects in data apparatus such

1989-12-04

1992-04-28

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

051093049

ABSTRACT:
A technique is provided for detecting defects in data apparatus, such as magnetic storage apparatus, wherein recovered data pulses are expected during periodic window intervals. Data pulses which may be phase shifted relative to predetermined data pulse times of occurrence are recovered, such as by playing back such pulses from a magnetic storage medium, for example, a hard disk drive. The recovered data pulses are selectively delayed, and the delayed and undelayed data pulses are multiplexed into a stream. The occurrences of such data pulses in the stream within the aforementioned window intervals are detected to provide indications of defects. A defect is indicated if a pulse in the stream does not occur within the window interval.

REFERENCES:
patent: 4578721 (1986-03-01), Brannan, Jr.
patent: 4612586 (1986-09-01), Sordello et al.
patent: 4682252 (1987-07-01), Smith
patent: 4726022 (1988-02-01), Chan et al.
patent: 4809088 (1989-02-01), Lofgren et al.

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