Adaptable clock control methods and apparatus for a direct acces

Details Adaptable clock control methods and apparatus for a direct acces Adaptable clock control methods and apparatus for a direct acces

1991-09-04

1993-10-19

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 32, 360 48, G11B 509

Patent

active

052551326

ABSTRACT:
A method and apparatus for modulating a data reference clock for rotational speed variations of the data storage disk in a direct access data storage file. A data reference clock is generated from an encoded disk rate clock of the data file. A readback signal from at least one predetermined region of the disk surface is sensed and a sync byte is detected responsive to the readback signal. An early window control signal and a late window control signal are generated corresponding to end boundaries for capturing readback encoded data signals. A load complete signal is identified responsive to the readback signal. The identified load complete signal with the early window control signal and the late window control signal and the generated data reference clock is adjusted responsive to overlapping compared signals.

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