Phase-change optical recording medium having first and...

Dynamic information storage or retrieval – Storage medium structure – Optical track structure

Reexamination Certificate

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C369S275200, C430S270130

Reexamination Certificate

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07616552

ABSTRACT:
An optical disc or other optical recording medium enables reading barcode-shaped-BCA marks in a burst cutting area (BCA) with tracking on while making tampering with the BCA marks difficult. The optical disc100has a first area102containing tracks at a first track pitch d2, and a second area101containing tracks at a second track pitch d1. The barcode-shaped marks104are recorded in the second area, and the second track pitch is wider than the first track pitch.

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Computer Translation of JP 2000-057632 (Feb. 25, 2000 ).

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