High-density optical disc

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

Reexamination Certificate

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C369S282000, C369S275100

Reexamination Certificate

active

07149176

ABSTRACT:
A compact high-density optical disc capable of securing recording/reproducing characteristics and high-density recording capacity. The high-density optical disc has a whole diameter of 80 mm or less to 28 mm, a whole thickness in a range of 0.3–0.7 mm, and a position where data starts being recorded in a range of 27–45 mm of the diameter. Thus, an existing disc drive can be used, the size of the high-density optical disc can be reduced, and high-density recording capacity can be secured.

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