Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1997-04-30
2000-09-05
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
369 47, G11B 509
Patent
active
061151998
ABSTRACT:
A circuit for preventing servo sectors from being overwritten during write operations due to misdetection of servo address mark (SAM) in a disk drive which includes a CPU, a SAM detection circuit for detecting the SAM, a reference pulse generator for generating reference pulses to obtain a servo detection timing in response to a SAM detection signal, a main counter for counting the system clock signals upon receipt the reference pulses, a data sector end pulse generator for generating a data sector end signal, a SAM detection window generator for generating a SAM detection window signal enabled to a window value loaded by the CPU upon receipt of the end signal and a pseudo SAM upon misdetection of the SAM in the SAM detection window signal, a pseudo SAM counter reset by the SAM detection signal for counting the PSAMs provided by the SAM detection window generator to generate a counting pulse when the counted value exceeds a given value, a delay and search flag bit generator for delaying the servo detection timing in response to the counting pulse generated by the PSAM pulse counter to generate a SAM search select signal and a search flag bit transferred to the CPU, and a SAM search mode control circuit for generating a SAM search start signal and disable signal according to the SAM search select signal provided by the delay and search flag bit generator.
REFERENCES:
patent: 4823212 (1989-04-01), Knowles et al.
patent: 5210660 (1993-05-01), Hetzler
patent: 5231545 (1993-07-01), Gold
patent: 5255136 (1993-10-01), Machado et al.
patent: 5384671 (1995-01-01), Fisher
patent: 5420730 (1995-05-01), Moon et al.
patent: 5442499 (1995-08-01), Emori
patent: 5444685 (1995-08-01), Masood et al.
patent: 5517371 (1996-05-01), Takei
patent: 5544135 (1996-08-01), Akin, Jr. et al.
patent: 5825568 (1998-10-01), Lee
patent: 5977472 (1990-12-01), Volz et al.
Ser. No. 08/884,486 entitled Automatic Servo Address Mark Detection and Servo Timing Compensation Circuit by Bang, the status is pending.
Bushnell Esq. Robert E.
Davidson Dan I.
Samsung Electronics Co,. Ltd.
Sniezek Andrew L.
LandOfFree
Circuit for preventing servo sector from being overwritten due t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit for preventing servo sector from being overwritten due t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for preventing servo sector from being overwritten due t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2218650