Dynamic magnetic information storage or retrieval – Recording or reproducing an information signal and a control...
Patent
1996-10-03
1999-01-19
Huber, Paul W.
Dynamic magnetic information storage or retrieval
Recording or reproducing an information signal and a control...
360 29, 360 42, G11B 502, G11B 509
Patent
active
058620052
ABSTRACT:
A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording area has at least one servo information field encoded in a wide bi-phase code pattern. The disk drive further includes a synchronous sampling data detection channel having a data transducer head positioned by a servo-controlled actuator over the recording track, a preamplifier for receiving electrical analog signals magnetically induced by the data transducer head from flux transitions present in at least the servo information field, a digital sampler for synchronously sampling the electrical analog signals to produce digital samples, and wide bi-phase decoding circuitry coupled to receive digital samples from the synchronous sampling data detection channel for decoding the wide bi-phase code pattern.
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Akin, Jr. William R.
Ehrlich Richard M.
Fisher Kevin D.
Henson James A.
Leis Michael D.
Harrison David B.
Huber Paul W.
Quantum Corporation
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