Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1997-08-14
2000-05-16
Tran, Thang V.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360 25, 360 31, 360 69, G11B 1504
Patent
active
060645350
ABSTRACT:
A system for halting operation of a hard disk controller when a write operation occurs during a servo positioning error condition including a memory cell for retaining an indication of whether a write operation occurred during the previous servo sector. A memory cell, such as a flip flop, is set on any occurrence of a write operation. With the reading of a next servo field, the output of the first flip flop is latched to a second flip flop. During a present servo sector, a servo positioning error signal is logically AND'ed with a write gate active signal where the write gate active signal is enabled if write gate is active in the present servo sector or write gate was active in the previous servo sector (as indicated by the output from the second flip flop.
REFERENCES:
patent: 4092682 (1978-05-01), Andrews, Jr. et al.
patent: 4809091 (1989-02-01), Miyazawa et al.
Josephson Russell B.
Lin Wen
Thorsted Wayne A.
Wilson Aaron W.
Galanthay Theodore E.
Jorgenson Lisa K.
Kubida William J.
STMicroelectronics N.V.
Tran Thang V.
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