Data recording medium, data recording method, and data recording apparatus, including additional recording features
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United States of America Patent
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Jul 17, 2007
Grant Date -
Sep 9, 2004
app pub date -
Apr 8, 2003
filing date -
Apr 12, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
With data of four symbols (FIG. 11A), a parity of two symbols (FIG. 11B) is created. These six symbols are EFM-modulated. Each symbol of eight bits is converted into a pattern of 14 bits (FIG. 11C). In a pit/land sequence formed on a disc (FIG. 11D), two symbols are rewritten. One symbol is (0.times.40). When an additional recording process is performed for the bit/land sequence, the pit length becomes long (FIG. 11E). The reproduced 14-bit data is converted into eight bits on the reproducing side. Thus, the original data (0.times.40) is rewritten to (0.times.22). A parity is also changed so that the additionally recorded data symbol (0.times.22) is not detected as an error.
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