198316 ⎘
Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups - or by different subgroups of group ; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording and a beam of light for reproducing, e.g. light-induced thermomagnetic recording, Kerr effect reproducing characterised by the transducing operation to be executed; Recording by modulating both the magnetic field and the light beam at the transducers one of the light beam or the magnetic field being modulated by data and the other by a clock or frequency generator
Optical storage medium, manufacturing method for optical storage medium, and optical storage device
#2Recording method and apparatus for optical recording medium with a laminated structure having ROM and RAM layers
#3Stray field equalization for improved domain expansion reading
#4Asymmetric run length constraints for increased resolution and power margin in mammos read-out