Information recording medium, information recording/reproducing apparatus and information management method

A write-once type recordable optical disk comprising:

• a recording area for recording data
• wherein one of (a) data modulated by a modulation system of the same run length restriction as run length restriction of a modulation system used for recording data, (b) data of patterns in which a frequency of occurrence of spaces of long codes is higher than a frequency of occurrence of the modulation system used for recording data based on the modulation system of the same run length restriction as the run length restriction of the modulation system used for recording data, and (c) data of successive patterns of the shortest code in the run length restriction of the modulation system used for recording data is overwritten to set recorded data into a destruction state on the optical disk.

An information management apparatus for a write-once type recordable optical disk comprising:

• means for specifying a recorded portion of the write-once type recordable optical disk,
• means for generating erasing data modulated by a modulation system of the same run length restriction as run length restriction of a modulation system used for recording data, and
• means for applying laser light based on the erasing data to the recorded portion and destroying recorded data.