Pin layer reversal detection

Details Pin layer reversal detection Pin layer reversal detection

2005-06-21

2005-06-21

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S075000

Reexamination Certificate

active

06909567

ABSTRACT:
A circuit to detect pin layer reversal including an input circuit to receive an input signal having a first portion to indicate a pin layer reversal and having a second portion to indicate a servo sync mark, a first servo sync mark detector for detecting a positive servo sync mark from the input signal, a second servo sync mark detector for detecting a negative servo sync mark from the input signal, and a circuit responsive to the positive servo sync mark and the negative servo sync mark to generate a signal to indicate if the servo sync mark has been reversed and to generate a signal to indicate the pin layer reversal.

REFERENCES:
patent: 5650887 (1997-07-01), Dovek et al.
patent: 6295175 (2001-09-01), Tomita et al.
patent: 6507447 (2003-01-01), Takahashi
patent: 6646822 (2003-11-01), Tuttle et al.
“GMR Design Dilemma: To Reset or Go Robust?”, Pennwellnet. Com, Oct. 1999. vol. 6 Issue II.

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