Magnetic disk

Details Magnetic disk Magnetic disk

1992-05-08

1993-01-26

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

G11B 5706

Patent

active

051826933

ABSTRACT:
A magnetic disk suitable for high density recording and reproduction of information wherein said disk is a coating type disk comprising a rigid substrate having a magnetic layer coated thereon from a magnetic coating composition of ferromagnetic submicron particles in a binder, wherein the substrate has a surface roughness Ra of up to 0.007 .mu.m, the magnetic layer has a thickness of up to 0.5 .mu.m, a surface roughness Ra of up to 0.005 .mu.m, and a porosity of 4 to 45%.

REFERENCES:
patent: 4734810 (1988-03-01), Nakayama et al.
patent: 5080948 (1992-01-01), Morita et al.

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