High data capacity storage medium with protection code,...

Details High data capacity storage medium with protection code,... High data capacity storage medium with protection code,...

2011-07-19

2011-07-19

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S283000, C369S284000

Reexamination Certificate

active

07983129

ABSTRACT:
The optical storage medium comprises a substrate layer, and a data layer disposed on the substrate layer, the data layer comprising data being arranged in tracks as marks and spaces. A protection code is coded in one of the tracks or a part of a track which code comprises marks of a first size and marks of a smaller, second size. The marks of the second size have in particular a width being smaller than the width of the marks of the first size. To obtain the protection code, a method is used comprising the steps of reading a track or a part of a track with a first laser power for obtaining a first data signal, reading the same track or the same part of a track in another step with a second laser power being different from the first laser power for obtaining a second data signal, and calculating the protection code by taking into account the first and the second data signals. The protection code may be calculated for example by a microprocessor of a respective data reading apparatus.

REFERENCES:
patent: 5311498 (1994-05-01), Horiguchi
patent: 6430128 (2002-08-01), Kato et al.
patent: 2004/0004922 (2004-01-01), Selinfreund et al.
patent: 2005/0007937 (2005-01-01), Mori et al.
patent: 1847989 (2007-10-01), None
patent: WO 2005/064601 (2005-07-01), None
Search Report, Jul. 18, 2008.

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