Rewritable type optical disc including recording marks over...

Details Rewritable type optical disc including recording marks over... Rewritable type optical disc including recording marks over...

2007-06-12

2007-06-12

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S275300, C369S275400, C369S059250

Reexamination Certificate

active

09984595

ABSTRACT:
A rewritable type optical disc includes recording tracks formed with break portions; and recording marks corresponding to predetermined data and formed on the recording tracks. The recording marks are formed over the break portions on the recording tracks. If the predetermined data, such as control data, recorded as the recording mark is illegally altered, the position of the recording marks are changed and some break portions are not covered by the recording marks. Since the return light level of the break portion, which is not covered by the recording mark, is different from the return light level of the break portion covered by the recording mark, such illegal alteration of the predetermined data such as the control data may be detected.

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