| 摘要 |
A method for protecting redundancy of data recorded through multiple layers of a recording medium is provided to reduce a danger of inaccessibility or a loss of the data when the data on at least one layer is not decoded and to improve creditability of the recording medium and stability of the recorded data. A method for protecting redundancy of data recorded through multiple layers of a recording medium includes a step of receiving a data stream, a step of encoding each data bit to the predetermined number of expression bits, a step of recording a first expression bit at a first layer, recording a second expression bit at a second layer, and recording a remaining expression bit at the other layers of the recording medium, a step of receiving a request for decoding the data recorded from the recording medium, a step of reading back the plural expression bits from the recording medium, and a step of decoding the plural expression bits to an original data bit.
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