| G | PHYSICS |
| 11 | INFORMATION STORAGE |
| B | INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER |
| 7 | Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor |
| 007 | Arrangement of the information on the record carrier, e.g. form of tracks ; , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track |
| 013 | for discrete information, i.e. where each information unit is stored in a distinct discrete location ; , e.g. digital information formats within a data block or sector |
| 0133 | Details of discrete information structures, e.g. shape or dimensions of pits, prepits |
