A method and apparatus for detecting a type of a disc in a disc drive system includes measuring an elapsed time between when a disc tray is in an open state and when it completely closes, comparing the elapsed time with a predetermined reference value, and determining whether the disc is a cartridge-type or a general-type based on the comparison result.

 
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> Redundant WDM transmission system optical receiver with reduced variable optical attenuators and/or variable dispersion compensation modules
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