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Optical disc and optical disc device

  • US 8,248,907 B2
  • Filed: 07/03/2007
  • Issued: 08/21/2012
  • Est. Priority Date: 02/16/2005
  • Status: Active Grant
First Claim
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1. An optical data storage medium comprising;

  • at least one Blu-ray layer having a track upon which a laser beam is focused during use; and

    a management area provided on said at least one Blu-ray layer, said management area having recorded data representing if another recording layer of different optical disc standard is present in said medium, wherein said recorded data has a first information section representing presence and absence of a DVD layer and a second information section representing presence and absence of a CD layer, and when said DVD layer is present in said medium, said first information section represents if said DVD layer is read-only type or recordable type, and when said CD layer is present in said medium, said second information section represents if said CD layer is read-only type or recordable type.

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