System and method for reducing circumferential transition...

Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier

Reexamination Certificate

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C360S075000

Reexamination Certificate

active

07085089

ABSTRACT:
For use with a servowriter that includes a writer core having a plurality of transistors that route servowriting current in response to a servo write signal, a write transition controller, a method of operating the same and a magnetic disk drive incorporating the controller or the method. In one embodiment, the controller includes: (1) logic circuitry, coupled to the writer core, that selectively blocks the servo write signal based on a state of a write current control signal and (2) current shunt circuitry, coupled to the writer core, that operates concurrently with the logic circuitry selectively to shunt current around the writer core based on the state.

REFERENCES:
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patent: 5570241 (1996-10-01), Nielsen et al.
patent: 5574702 (1996-11-01), Ishii
patent: 5612828 (1997-03-01), Brannon et al.
patent: 6583946 (2003-06-01), Emerson
patent: 6624957 (2003-09-01), Yun
patent: 6687064 (2004-02-01), Jiang et al.

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