Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1977-08-01
1979-04-03
Wolff, John H.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 21, G11B 509, G11B 2710
Patent
active
041480805
ABSTRACT:
Techniques and associated apparatus for recording and detecting data; and especially for detecting and processing recorded data with greater accuracy.
Record information (computer data bits) is recorded along one or more information zones (tracks) of a medium. Head-positioning information may be derived from this, using a "di-gap" transducer system comprising at least one related pair of transducer gaps aligned to register and sense information along a common record track, with the gaps being skewed oblique to the track direction, and aligned transverse to one another.
"Servo-bits" (providing head positioning information) and "work-bits" may both be recorded along a given track, these bits, like the mentioned gaps, being skewed relative to the track direction and aligned transverse to one another; the servo-bits in any one track thus being aligned parallel to one of the gaps while the companion work-bits are parallel to the other gap, -- these gaps however being functionally interchangeable, with neither gap being dedicated to servo data or work data.
Di-bits may be recorded (or pairs of parallel bits) in adjacent tracks but distinguished by recorded-frequency. Also, data read-out may be "clocked" using means adaptive to varying data rate.
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Blessum Norman S.
Ragle Herbert U.
Burroughs Corporation
Cass Nathan
McCormack John J.
Peterson Kevin R.
Wolff John H.
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