The MultiMedia Compact Disc is a proposal for a new optical recording medium with a storage capacity five times higher than the conventional Compact Disc. The major part of the capacity increase is achieved by the use of optics, shorter laser wavelength and larger numerical aperture, which reduces the spot diameter by a factor of 1.5. The track formed by the recorded pits and lands as well as the track pitch can be reduced by the same factor. The storage capacity is further increased by a complete redesign of the logical format of the disc including a more power error correction (CIRCPlus) and recording code (EFMPlus). This paper outlines the channel coding and the related system requirements.
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