Information storage apparatus and information reproducing method for reducing cross talk from a region adjacent a recorded information mark
View Patent ↗An information storage apparatus includes a mark reading section for reading a mark written on an information storage medium. A recording state changing section is provided for changing a recording state in an adjacent region situated next to a region from which the mark reading section fails to read a mark, so as to reduce cross talk caused by the adjacent region. The mark reading section reads the mark in the failed region again after the recording state changing section changes the recording state in the adjacent region.
1. An information storage apparatus comprising:
a mark reading section for reading marks written on an information storage medium having a plurality of regions in which information marks are written, said regions being linearly shaped and extending parallel to each other; and
a recording state changing section for changing a recording state in an adjacent region extended next to a failed region from which said mark reading section fails to read a mark, to reduce cross talk caused by said adjacent region if said mark reading section fails to read said mark,
wherein said mark reading section again reads the mark in said failed region after changing the recording state in said adjacent region by said recording state changing section.
2. The information storage apparatus according to claim 1 , wherein said recording state changing section erases a mark written in said adjacent region.
3. The information storage apparatus according to claim 1 , wherein said recording state changing section writes on an overwriting basis in said adjacent region a mark generating cross talk lower than cross talk caused due to a mark written in said adjacent region.
4. The information storage apparatus according to claim 1 , wherein said recording state changing section writes on an overwriting basis in said adjacent region a mark having a length shorter than that of a mark written in said adjacent region.
5. The information storage apparatus according to claim 1 , wherein said recording state changing section writes on an overwriting basis in said adjacent region a mark having a width narrower than that of a mark written in said adjacent region.
6. The information storage apparatus according to claim 1 , wherein said recording state changing section writes on an overwriting basis in said adjacent region a mark with power weaker than power used when a mark is written in said adjacent region.
7. The information storage apparatus according to claim 1 , wherein said recording state changing section changes a recording state in an adjacent region after evacuating information recorded in said adjacent region and restores said evacuated information in said adjacent region after again reading a mark in said failed region by said mark reading section.
8. The information storage apparatus according to claim 1 , wherein said information storage medium includes an alternative region, said recording state changing section performing evacuation of information recorded in said adjacent region to said alternative region and registration of use of said alternative region instead of said adjacent region before changing a recording state in said adjacent region.