Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1995-12-11
1998-01-06
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, 360 7303, G11B 700
Patent
active
057062650
ABSTRACT:
A spindle motor driving control circuit in a disk drive recording device including a spindle motor for rotating a disk recording medium, a motor driving unit for controlling driving of the spindle motor, and a control unit for controlling the overall operation of the disk drive recording device. The circuit includes: a servo address mark (SAM) detecting unit for detecting a servo address mark (SAM) recording pattern from a signal read from the disk recording medium and generating a servo address mark (SAM) pulse corresponding to detection of the servo address mark (SAM) recording pattern; a first counting unit for starting a first counting operation and generating a first count value in response to the servo address mark (SAM) pulse; a first memory unit for storing a predetermined reference value provided from the control unit; a comparing unit for comparing the predetermined reference value with the first count value and generating an end of servo sector (ENDS) pulse when the two values are equal; a window length counting unit for starting a second counting operation and generating a second count value in response to the end of servo sector (ENDS) pulse, and terminating the second counting operation in response to the servo address mark (SAM) pulse; and an adding unit for generating an added value by adding the second count value to the predetermined reference value. The control unit controls the driving of the spindle motor based on the added value.
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Bushnell Esq. Robert E.
Samsung Electronics Co,. Ltd.
Tran Thang V.
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