Magnetic disk device and method of recording/retrieving informat

Details Magnetic disk device and method of recording/retrieving informat Magnetic disk device and method of recording/retrieving informat

1991-05-06

1992-04-28

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Head

Gap spacer

360110, 360126, 360122, G11B 523, G11B 5127

Patent

active

051093111

ABSTRACT:
This invention provides a magnetic disk device having a total memory capacity of 30 giga bytes or more, or more desirably 30.about.40 giga bytes. The magnetic disk used in this magnetic disk device has a plane record density of 45.about.80 mega bits per square inch. The thin film magnetic head has a pole thickness (P.sub.T), a magnetic flux density (B.sub.s), a magnetic gap depth (G.sub.d) and a record wavelenth (.lambda.) which satisfy the formula

REFERENCES:
patent: 4432025 (1984-02-01), Grogan
patent: 4742413 (1988-05-01), Schewe
patent: 4799118 (1989-01-01), Yamada et al.
patent: 4951166 (1990-08-01), Schewe
J. Apply. Phys. 61(8), Apr. 15, 1987, American Institute of Physics, pp. 4157-4162, "Design and Fabrication of Thin-Film Heads Based on a Dry Process" by Hanazono et al.

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