Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1998-10-20
2000-09-19
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
G11B 509
Patent
active
061221244
ABSTRACT:
An adaptive media speed drive unit for use with a magnetic storage medium, the magnetic storage medium having a timing based servo pattern written thereon, the servo pattern including transitions, the drive unit including a magnetic head including a servo read element configured to read the servo pattern and produce a signal, the signal including recognizable signal events corresponding to the servo read element reading servo transitions; a servo decoder including time capture logic configured to determine the amount of time between the signal events; and a digitally controlled oscillator configured to produce a tracking clock which a write element can use to write data to the magnetic medium with a uniform spacing regardless of magnetic medium speed. A method for producing a tracking clock signal used for writing data in an equally spaced manner to a magnetic medium unit, the magnetic storage medium having a servo pattern written thereon, the servo pattern including transitions, the magnetic medium being movable relative to a magnetic head and the head including a servo read element configured to read the servo pattern and produce a signal, the signal including recognizable signal events corresponding to the servo read element reading servo transitions, the method comprising receiving the servo signal, and determining the speed of the magnetic medium, with respect to the head, by determining the amount of time between the signal events; and producing the tracking clock.
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Fasen Donald J.
Hessing Charles E.
Willcocks Benjamin A.
Hewlett-Packard Co.
Kim W. Chris
LandOfFree
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