Disk-type recording medium and storage apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 21, 1993
Grant Date -
N/A
app pub date -
Sep 13, 1991
filing date -
Sep 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A disk-type recording medium having a circular substrate on which a recording layer is formed does not include any through hole formed in the center of rotation. Since no through hole is formed, it is possible to improve the reliability of the medium with regard to its strength, and to reduce the thickness of the substrate. Further, it is possible to render the thickness of the recording coating uniform.
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