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Optical disc and optical disc device

  • US 9,147,425 B2
  • Filed: 08/06/2014
  • Issued: 09/29/2015
  • 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 recording layer, satisfying BD optical disc standard, having a track upon which a laser beam is focused during use; and

    a management area provided on said at least one recording layer satisfying BD optical disc standard, said management area having recorded data representing if another recording layer of different optical disc standard is present in said medium, whereinsaid recorded data has a first information section representing presence and absence of a first recording layer having first optical disc standard and a second information section representing presence and absence of a second recording layer having second optical disc standard,when said first recording layer is present in said medium, said first information section represents if said first recording layer is read-only type or recordable type, andwhen said second recording layer is present in said medium, said second information section represents if said second recording layer is read-only type or recordable type,said recorded data is provided only on the management area of the layer satisfying BD optical disc standard, andsaid recorded data represents absence of a recording layer by bit values of 00.

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