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CD

 Optical discs used originally for storing and playback sound tracks but is developed later to store data, rewrite-ability and much more features, and is the basic form of latter development in optical format
Physical detail:
A standard CD is 1.2mm thick, 15-20grams in weight, diameter of 120mm. It consists of 4 layers as stated from the figure: a polycarbonate layer that contain data,

DVD - Phat

Bluray - Thai

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