Optical information recording and reproducing apparatus and optical disc
First Claim
1. An information recording and reproducing apparatus comprising means including a recording medium having an information recording region divided into a plurality of sectors each having an address part recorded with an address signal and a data recording part to be recorded with data, and means for overwriting a predetermined signal in the address part of a sector thereby making the reproduction of the sector address of the address part impossible.
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Accused Products
Abstract
An information recording and reproducing apparatus records and reproduces information in and from a recording medium including an information recording region divided into a plurality of sectors. In recording and reproducing information in and from the recording medium, each sector includes a sector address part formatted and a data recording part for recording data. A predetermined signal is overwritten in the address of a sector thereby making reproduction of the address impossible to prevent data from being recorded again by error in the sector containing data, while at the same time protecting the writing in the sectors. In data recording, on the other hand, the address signal from the recording medium is binary-coded at a different level to detect a sector of unstable address reproduction, so that a predetermined signal is overwritten in the address of this sector to make subsequent reproduction of the address impossible, thus permitting recording only in the sectors of stable address reproduction for stable data reproduction. Further, an optical disc having sectors of stable address reproduction alone detects a sector of unstable reproduction at the time of inspection, and overwrites a predetermined signal in the address part of the particular sector to make subsequent reproduction of the address impossible.
46 Citations
6 Claims
- 1. An information recording and reproducing apparatus comprising means including a recording medium having an information recording region divided into a plurality of sectors each having an address part recorded with an address signal and a data recording part to be recorded with data, and means for overwriting a predetermined signal in the address part of a sector thereby making the reproduction of the sector address of the address part impossible.
- 5. An optical disc comprising an information recording region divided into a plurality of sectors each including an address part recorded with an address signal and a data recording part to be recorded with data, wherein the binary level in reproducing the address from a reproduced address signal obtained by reproduction of the address part is changed and the reproduced address is compared with the sector address of a relevant sector, so that when said addresses fail to coincide with each other, a predetermined signal is overwritten on the address part, whereby subsequent reproduction of the particular address part is made impossible.
Specification