how combo drive differtiate between cd and dvd ?

this i have asked to many person ,but no one gave me satisfactory answer. can u give the answer.
how combo drive differtiate between cd and dvd ?


  • You mean a hardware CD/DVD reader?

    How it can detect the difference?

    I guess the laser reads the inner parts of the CV/DVD
    to identify if it is a DVD or CD. That is not that difficult to
    do I guess. The readers can read out from the CD/DVD the
    manufacturer and I guess there's some info about type as well.

    Tore Nestenius
    [blue][italic][b]/WEBMASTER[/b][/italic][/blue] Programmers Heaven

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