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
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
