Disk with substrate of alumina silicate resin glass

Details Disk with substrate of alumina silicate resin glass Disk with substrate of alumina silicate resin glass

1988-11-08

1990-03-13

Hecker, Stuart N.

Dynamic magnetic information storage or retrieval

Record medium

Disk

428694, 428900, G11B 582

Patent

active

049087274

ABSTRACT:
A vertical recording system using a rigid disk medium with high recording density has a substrate made of alumina silicate resin glass and a vertical magnetic anisotropic film located on said substrate. Said anisotropic film has an easy axis of magnetization in the thickness direction of the film, and the hard axis of magnetization in the film plane. The maximum surface roughness R.sub.max of said disk is less than 50 .ANG., and a magnetic recording head which moves relative to the medium operates with said head contacted with the medium. A recording density higher than 200 KFRPI (kilo flux reversal per inch) is obtained by the present invention.

REFERENCES:
patent: 4327387 (1982-04-01), Plotto
patent: 4590119 (1988-05-01), Kawakami et al.
patent: 4619856 (1986-10-01), Kamada et al.
patent: 4633351 (1986-12-01), Bardos et al.
patent: 4659606 (1987-04-01), Wada et al.

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