Information recording medium, information...

Details Information recording medium, information... Information recording medium, information...

2005-07-28

2008-11-18

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S059230

Reexamination Certificate

active

07453780

ABSTRACT:
There is provided an information management apparatus which can make it impossible to read out data recorded on a write-once type recordable optical disk as required and the usefulness thereof is enhanced. When recorded data is destroyed on the write-once type recordable optical disk, data modulated by a modulation system of the same run length restriction as run length restriction of a modulation system used for recording data is overwritten and recorded, data is overwritten and recorded by use of patterns in which the frequency of occurrence of spaces of the longest code is higher than the frequency of occurrence of the modulation system used for recording data, or data is overwritten and recorded by use of successive patterns of the shortest code in the run length restriction of the modulation system used for recording data.

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patent: 6671249 (2003-12-01), Horie
patent: 6834034 (2004-12-01), Yokokawa
patent: 2002/0114239 (2002-08-01), Yokokawa
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