Magnetic disk with surface protective layer having convex portio

Details Magnetic disk with surface protective layer having convex portio Magnetic disk with surface protective layer having convex portio

1990-10-11

1994-02-08

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record medium

360135, G11B 574, G11B 582

Patent

active

052853438

ABSTRACT:
There is provided a magnetic disk apparatus including at least one magnetic disk having a magnetic layer and a surface protective layer on a substrate; a magnetic head which faces the magnetic disk in a rotating state with a micro gap and is supported by a slider; rotating means for rotating the magnetic disk; and magnetic head positioning means for moving and positioning the magnetic head to a predetermined position on the magnetic disk, wherein a plurality of protrusions each having a flat surface are formed in at least a region on the surface of the magnetic disk where a contact start/stop operation can be executed, an area ratio of the protrusions per 1 mm.sup.2 lies within a range from 0.1 to 80%, a height of the protrusion of the maximum height among the protrusions lies within a range from 5 to 40 nm, and the magnetic layer is formed on the whole surface on the base plate. According to the above magnetic disk apparatus, the frictional force between the disk and the head is small, and the floating height of the head can be reduced, and good floating stability is obtained, so that excellent recording and reproducing characteristics are obtained.

REFERENCES:
patent: 4688130 (1987-08-01), Nakanouchi et al.
patent: 4816933 (1989-03-01), Izumi et al.
patent: 4939614 (1990-07-01), Shirakura et al.
patent: 5047274 (1991-09-01), Tsuya et al.
patent: 5093173 (1992-03-01), Nakagawa et al.
Patent Abstracts of Japan, vol. 13, No. 54 (P-824), Feb. 8, 1989 (for Japanese Kokai 63-244312, Oct. 11, 1988).

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