Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1992-07-08
1994-10-11
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record medium
Disk
360133, G11B 582
Patent
active
053552709
ABSTRACT:
A magnetic recording medium in which the center of a magnetic head can be brought to a centerline of a reference track, thereby enhancing the reliability of the magnetic recording medium, the reference track being provided at a predetermined position of a magnetic layer of the medium, a number of magnetic head-tracking optical tracks are provided respectively at positions spaced predetermined distances from the reference track in a direction perpendicular to the direction of travel of the magnetic head, and a data track is formed between any two adjacent ones of the magnetic head-tracking optical tracks, the reference track having a pair of reference recess regions arranged symmetrically with respect to an arbitrary point on the centerline of the reference track, and a flat portion with no recess formed adjacent to each of the reference recess regions, the recess in each reference recess region being formed by cutting by a laser.
REFERENCES:
patent: 4861656 (1989-08-01), Uchiyama et al.
patent: 4879691 (1989-11-01), Suzuki
patent: 4961123 (1990-10-01), Williams et al.
patent: 5210672 (1993-05-01), Ivers et al.
Fukunaga Kazuya
Umebayashi Nobuhiro
Hitachi Maxell Ltd.
Wolff John H.
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