Dynamic magnetic information storage or retrieval – General processing of a digital signal – Address coding
Patent
1997-03-07
2000-04-11
Faber, Alan
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Address coding
360 51, 360 40, 360 44, 360 7708, 360 7814, G11B 509
Patent
active
060494387
ABSTRACT:
A method and apparatus for writing binary servo data into the servo bursts contained on the storage medium of a storage device. The binary servo information may include track identifying information such as a track number, cylinder number, head number, sector number, index and/or SID. A burst includes T time slots, each slot comprising one cycle of the servo burst frequency, and the servo data to be written comprises X bits of binary data. Each one-bit of the servo data is represented as a slot containing a transition, and each zero-bit is represented as an empty or null slot. In this manner, the present invention provides a highly bit-efficient scheme for representing digital servo data. A high quality PES signal is assured by writing the binary servo information in such a manner as to guarantee a threshold number of transitions per burst as required for accurate peak-hold detection. Data is encoded to provide a constant or substantially constant number of positive transitions per burst to allow accurate integration detection. If the amount of real estate consumed by the servo regions is less critical than the reliability of the binary data, robustness may be enhanced by using dibits rather than single transitions to represent the data.
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Serrano Louis Joseph
Yu Mantle Man-Hon
Bluestone Randall J.
Faber Alan
Foerster Ingrid M.
International Business Machines - Corporation
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