Magnetic disk drive including read channel for processing...

Details Magnetic disk drive including read channel for processing... Magnetic disk drive including read channel for processing...

2005-05-17

2005-05-17

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

C360S031000, C360S053000, C360S066000, C360S040000, C360S043000, C360S045000, C360S055000

Reexamination Certificate

active

06894855

ABSTRACT:
A disk drive of perpendicular magnetic recording method including a read head comprising a GMR element and a drive using a double-layered disk medium, is disclosed. In the magnetic field response characteristic of the GMR element, the relationship between the degree of nonlinearity and a pulse width at 50% threshold (PW50) of a differentiated read signal is used. The degree of nonlinearity of the GMR element is adjusted such that the PW50 is smaller than the maximum value. The read channel comprises a differentiation circuit for converting the read signal output from the GMR element into the differentiated read signal.

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Chinese Office Action, dated August 20, 2004 for Patent Application No. 02131837.9.

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