FIELD: method fro recording addition data onto record carrier which has data recorded in advance.
SUBSTANCE: in accordance to invention, data recorded in advance are received by modulation of M-bit data to N-bit data, where M<N. In addition, data to be recorded are recorded by changing a certain bit or bits of N-bit data. Remaining part of N-bit data remains unchanged.
EFFECT: increased efficiency.
24 cl, 44 dwg
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