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Optical recording medium, method of reproducing information signals recorded on the optical recording medium and data recording device used to produce the optical recording medium.
Magneto-optical recording medium on which it is possible to record information of high character density and methods for reproducing the recorded information.
Recording medium capable of recording a first type of data and a second type of data, reproduction method and reproduction device for reproducing this recording medium and recording device for recording the first type of data and the second type environmental data