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Identifying optical disc properties from information read from label side of optical disc

  • US 7,394,738 B2
  • Filed: 03/20/2002
  • Issued: 07/01/2008
  • Est. Priority Date: 03/20/2002
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • reading a signal as reflected by a label side of an optical disc, without reading any indicia on the label side of the optical disc, an indicia defined as data encoded within an encoded data format;

    attempting to identify one or more properties of the optical disc from the signal reflected by the label side of the optical disc;

    where the one or more properties cannot be identified from the signal reflected by the label side of the optical disc,writing a mark to the label side of the optical disc, the mark being one of a pixel written sufficiently small to escape casual detection by a user and a mark written to a border of the label side of the optical disc;

    reading a second signal reflected by the mark written to the label side of the optical disc; and

    ,identifying the one or more properties of the optical disc from the second signal reflected by the mark written to the label side of the optical disc.

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