Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2008-04-22

2008-04-22

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

Reexamination Certificate

active

10998594

ABSTRACT:
A data track area and a servo pattern area are formed on a magnetic recording medium by embedding a nonmagnetic material inside concaves in a plurality of types of convex/concave patterns formed of a magnetic material on a substrate. The servo pattern area includes a plurality of types of first functional areas, in which control signals for disk access are recorded during manufacturing using the convex/concave patterns, and a second functional area, in which a convex/concave pattern of a different type to the convex/concave patterns of the respective first functional areas is formed and in which the nonmagnetic material is embedded so that an average height within the second functional area is substantially equal to an average height in the data track area.

REFERENCES:
patent: 5828536 (1998-10-01), Morita
patent: 6088200 (2000-07-01), Morita
patent: 2002/0051315 (2002-05-01), Mundt et al.
patent: 11-161944 (1999-06-01), None
Hattori et al, Fabrication of Discrete Track Perpendicular Media for High Recording Density, Jul. 2004, IEEE Transactions on Magnetics, vol. 40, No. 4, pp. 2510-2515.
U.S. Appl. No. 10/923,728, filed Aug. 24, 2004.
English Language Abstract of JP 11-161944.

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