Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1991-09-25
1994-06-14
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 51, 360 7708, G11B 509
Patent
active
053215605
ABSTRACT:
The servo field includes at least one sub-field of prerecorded information that simultaneously provides (i) data for a first servo function and (ii) data for at least one other servo function. In another embodiment, a prerecorded embedded servo field includes a first sub-field of prerecorded information that simultaneously provides (i) automatic gain control data for a third sub-field and (ii) data for a first servo function, and a second sub-field of prerecorded information that simultaneously provides (i) automatic gain control (AGC) data for the third sub-field and (ii) data for a second servo function. Since the first and the second sub-fields in the servo field of this invention are used for AGC and another servo function, the sub-fields are arranged within the servo field so that the sub-field that requires the least precise AGC control is first and the sub-field that requires the most precise AGC control is last. To provide AGC data for the first sub-field in the servo field of this invention, AGC data is contained in a write-to-read transition area of the data region preceding the first servo sub-field. The sector mark field of this invention is immune to single bit errors. Specifically, the sub-field used for synchronization is designed so that servo synchronization timing is not lost due to a single bit error in the synchronization sub-field or in the sub-fields preceding the synchronization sub-field.
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"Quantum Low Power Products, Technical Highlights", a Quantum Corp Publication, Sep. 1990, 9 pages total.
Huber P. W.
Integral Peripherals, Inc.
Psitos Aristotelis
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