Magnetic disk producing method

Details Magnetic disk producing method Magnetic disk producing method

2006-02-16

2008-12-30

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

Reexamination Certificate

active

07471478

ABSTRACT:
A magnetic disk can be magnetized simply and in a short time. A magnetic disk producing method produces a magnetic disk having a central hole, an outer radius, a plurality of annular recording tracks formed in a direction from the central hole toward the outer radius, each recording track including a plurality of sectors, and a recess formed between adjacent recording tracks to a predetermined depth. The method includes providing a magnetizing master disk magnetized in a predetermined pattern of alternating N and S polarities extending in a direction from a center of the master disk toward an outer radius thereof; and superposing the master disk on the magnetic disk to magnetically transcribe a magnetic signal to the recording tracks based on the predetermined pattern.

REFERENCES:
patent: 2003/0034862 (2003-02-01), Nishikawa et al.
patent: 2005/0219730 (2005-10-01), Sakurai et al.
patent: 2863190 (1990-10-01), None

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