Magnetic disk and a glass substrate for the magnetic disk

Details Magnetic disk and a glass substrate for the magnetic disk Magnetic disk and a glass substrate for the magnetic disk

1993-11-23

1999-07-20

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

G11B 582

Patent

active

059263520

ABSTRACT:
A magnetic disk comprises a glass substrate and a magnetic layer formed on the glass substrate wherein the maximum deflection of a bent portion in the radial direction of the magnetic disk with respect to a reference length of 2 mm is 1,500 .ANG. or less in the entire region of a surface of the disk excluding annular areas having a width of 250 .mu.m which are respectively formed inwardly from annular lines at which chamfered portions formed at the inner and outer peripheries of the magnetic disk and the disk surface intersect.

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