Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Reexamination Certificate
2005-07-15
2008-10-28
Nguyen, Hoa T (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
C360S048000, C360S051000, C360S061000, C360S077020
Reexamination Certificate
active
07443626
ABSTRACT:
A patterned disk medium includes a disk-shaped flat substrate including a first surface and a second surface located an opposite side of the first surface. First servo pattern areas including portions provided with magnetic members and portions provided with no magnetic members are provided on the first surface. Second servo pattern areas including portions provided with magnetic members and portions provided with no magnetic members are provided on the second surface. The magnetic members of the first and second servo pattern areas are magnetized in a direction perpendicular to the first and second surfaces. The magnetic polarity of the surfaces of the magnetic members of the second pattern areas differs from that of the surfaces of the magnetic members of the first pattern areas.
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Asakura Makoto
Kikitsu Akira
Tanaka Yoichiro
Kabushiki Kaisha Toshiba
Nguyen Hoa T
Pillsbury Winthrop Shaw & Pittman LLP
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