Dynamic magnetic information storage or retrieval – Head
Reexamination Certificate
2011-05-10
2011-05-10
Cao, Allen T (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Reexamination Certificate
active
07940494
ABSTRACT:
The magnetic recording medium includes a substrate and a recording layer formed in a predetermined concavo-convex pattern over the substrate, the recording layer including recording elements each formed as a convex portion of the recording layer. Surface steps are formed in an outer area including a radially outermost portion of a recording area. Each surface step is formed in such a manner that a portion over a concave portion between the recording elements is recessed toward the substrate to a level below a portion over the recording element. The surface steps are formed such that the recording area can be sectioned into an annular area adjoining the outer area and the outer area where height of the surface steps is larger than that in the annular area.
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Shimakawa Kazuya
Suwa Takahiro
Cao Allen T
Oliff & Berridg,e PLC
TDK Corporation
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