Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1984-12-20
1986-10-21
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 39, G11B 509
Patent
active
046188983
ABSTRACT:
A method and apparatus for reading data from a disk having missing or unreadable field address marks. Expected address marks are searched for within a time window which is generated using a counter. When an expected address mark is generated at any time within the time window, the counter is set or reset to generate another time window within which the next address mark is expected to occur. By starting or restarting the counter each time an expected address mark is detected the effects of variations in spindle speed which occur prior to the detection of the address mark are eliminated, thus increasing the probability that readable address marks will be detected within a time window.
REFERENCES:
patent: 4357707 (1982-11-01), Delury
patent: 4425646 (1984-01-01), Kinoshita et al.
patent: 4459623 (1984-07-01), Glenn, II
patent: 4472818 (1984-09-01), Zapisek et al.
Drew John
Dujari Vineet
Shebanow Michael C.
Young Mark S.
Advanced Micro Devices , Inc.
Becker Warren M.
Canney Vincent P.
King Patrick T.
Tortolano J. Vincent
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