Magnetic data reading apparatus and method using inductive and m

Details Magnetic data reading apparatus and method using inductive and m Magnetic data reading apparatus and method using inductive and m

1996-05-01

1999-01-12

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 7708, G11B 502

Patent

active

058597395

ABSTRACT:
A rigid disk drive unit includes head assemblies having both inductive and magnetoresistive heads. When information is read from a disk surface, signals from the inductive head and the magnetoresistive head are combined to provide an output signal, thereby to overcome disadvantages of using either signal alone. The relative contributions of the magnetoresistive and inductive signals are varied to optimize performance depending on the radial position of the head assembly over a magnetic disk and upon whether the information being read is data or servo position information. The inductive signal is ignored during data recovery procedure head shift operations.

REFERENCES:
patent: 4504880 (1985-03-01), Church et al.
patent: 5430584 (1995-07-01), Petersen
patent: 5463603 (1995-10-01), Petersen
IBM Technical Disclosure Bulletin, vol. 38, No. 9, Sep. 1995, New York, US, pp. 409-410, XP000540312 Anonymous: "Servo-Burst Pattern Read by Write Element".
Idema MR Head/Technology Symposium, Feb. 2, 1994, Santa Clara, CA.

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