Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Reexamination Certificate
2007-07-24
2011-10-25
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
C369S275100
Reexamination Certificate
active
08045441
ABSTRACT:
In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced by using this information to select a tracking error signal generating method.
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Nakahara Hironori
Ogawa Masaharu
Takeshita Nobuo
Birch Stewart Kolasch & Birch, LLP.
Feild Joseph
Heyi Henok
Mitsubishi Electric Corporation
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