Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1993-06-18
1996-04-02
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record medium
Disk
360133, G11B 582
Patent
active
055046460
ABSTRACT:
There is provided a magnetic disk apparatus comprising: 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 a actuator 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. According to the above magnetic disk apparatus, since the frictional force between the disk and the head is small and the flying height of the head can be reduced and the good floating stability is obtained, so that the excellent recording and reproducing characteristics are derived. Further, protrusions are formed on the protective layer of the magnetic disk and the protrusion shapes are changed in a accordance with a radial position of the magnetic disk depending on the flying height of the magnetic head. According to the above magnetic disk apparatus, since the change of spacing can be set smaller than the change of the flying height, high recording density can be achieved.
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patent: 4829799 (1989-05-01), Coe
patent: 4939614 (1990-07-01), Shirakura
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patent: 5093173 (1992-03-01), Nakagawa et al.
patent: 5166006 (1992-11-01), Lal et al.
patent: 5202810 (1993-04-01), Nakamura
Patent Abstracts of Japan, vol. 13, No. 54 (P-824), Feb. 8, 1989 (for Japanese Kokai 63-244312 published Oct. 11, 1988).
Gomi Kenichi
Inomata Youichi
Kato Yoshiki
Miyake Yoshihiko
Ohura Masaki
Heinz A. J.
Hitachi , Ltd.
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