Master disk for magnetic transfer, a method of drawing a...

Details Master disk for magnetic transfer, a method of drawing a... Master disk for magnetic transfer, a method of drawing a...

2010-10-22

2011-10-04

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage different from retrieval

C369S013020, C360S015000

Reexamination Certificate

active

08031562

ABSTRACT:
A master disk for magnetic transfer of a reference servo signal in a spiral mode, having a pattern including a plurality of dots groups, which are disposed at different radial positions of the master disk with a first pitch, and correspond to the reference servo signal in the spiral mode. Each of the plurality of dot groups includes a plurality of dots, successively disposed with a second pitch along a circumferential direction of the master disk at a same one of the radial positions. Each of the plurality of dots is of a ferromagnetic material, and has four sides, two opposing sides thereof extending in the circumferential direction, and the other two opposing sides thereof extending in a radial direction of the master disk.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 2011/0096640 (2011-04-01), Kikuchi
patent: 2001-243733 (2001-09-01), None
patent: 2002-083421 (2002-03-01), None
patent: 3343343 (2002-08-01), None
patent: 2006-147139 (2006-06-01), None
patent: 3999436 (2007-08-01), None

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