Method for recording a positioning signal on a magnetic recordin

Details Method for recording a positioning signal on a magnetic recordin Method for recording a positioning signal on a magnetic recordin

1993-08-16

1995-03-28

Hajec, Donald

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, 360 55, 360135, G11B 5596, G11B 502, G11B 582

Patent

active

054022789

ABSTRACT:
This invention relates to a method for recording a positioning signal on a disk having a projection pattern. The method includes rotating a magnetic disk having a magnetic layer on a non-magnetic substrate having a projection pattern thereon, flowing the first DC current to a magnetic head, moving the magnetic head in the direction of the diameter over the magnetic disk whereby to magnetize the whole magnetic layer of the magnetic disk in the first direction, then rotating the magnetic disk, flowing the second DC current to the magnetic head, moving the magnetic head in the direction of the diameter over the magnetic disk whereby to magnetize only the magnetic layer of the projection portion of the magnetic disk in the second direction opposite to the first direction so as to record a positioning signal on the magnetic disk.

REFERENCES:
patent: 5296995 (1994-03-01), Yonezawa et al.

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