Optical recording medium with region for identifying defective written data
US5164577A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1990 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Oct 2, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A card type optical recording medium according to the present invention relates to a card type optical recording medium arranged in such a manner that a plurality of tracks are formed on a recording region provided on a card type substrate and the tracks are divided into a plurality of blocks so that data is optically recorded to each of the blocks. The card type optical recording medium according to the present invention is characterized in that a portion of the recording region is provided with a defective block information region for determining a good or bad condition of the block to which the data is recorded. As a result, the defective block information can be read prior to the reading of data. Therefore, the necessity of accessing the defective block can be eliminated, causing a good reading efficiency to be realized. Furthermore, since the conventional necessity of writing the serial number to the block of the data recording region can be eliminated, an effect can be obtained in that the data capacity of the data recording region can be enlarged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.