Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Reexamination Certificate
2005-02-18
2009-08-11
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
C369S047400
Reexamination Certificate
active
07573786
ABSTRACT:
An optical disk apparatus is disclosed which can suppress excessive reduction of recording speed on the inner side of a disk and that can assure quick response of accessing operation. When, at the time of access, a write or read operation is performed while returning to a second disk radial position that is located inside a first disk radial position, based on a positional relationship of the first and second disk radial positions with respect to a reference radial position, the rotation control method of the optical disk at the second disk radial position is selected out of a constant linear velocity method and a constant angular velocity method so that, if a user disk area is relatively small and located only on the inner side, writing or reading velocity on the inner side is not reduced or, if the user disk area is relatively large and located both on the inner and outer sides, writing or reading velocity on the outer side is not reduced and, at the time of access, regardless of the size of the user data area, the variation of rotation speed of a disk motor at the second disk radial position is suppressed and quick response is assured.
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State Intellectual Property Office of China (SIPO) office action dated Nov. 2, 2007 for patent application CN2005-100730700.
Feild Joseph H
Heyi Henok G
Hitachi-LG Data Storage, Inc.
Townsend and Townsend / and Crew LLP
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