with cylinders or cylinder-like carriers , e.g. truncated cones

Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor > Recording, reproducing or erasing systems characterised by the shape of the carrier > with cylinders or cylinder-like carriers, e.g. truncated cones

Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation , reproducing using an optical beam at lower power ; Record carriers therefor (G11B11/00, G11B13/00 take precedence) > Recording, reproducing or erasing systems characterised by the shape of the carrier > with cylinders or cylinder-like carriers , e.g. truncated cones