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24332873 blu-ray-disc-ppt
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4. HISTORY 1 st GENERATION : Compact Disc (CD):-- 650/700MB It is with us for over 20 yrs. Wavelength of laser which reads data: 780nm Color of laser: Red 2nd GENERATION : Digital versatile disc (DVD):-- 4.7GB It offers high quality sound and video than CD. Wavelength of laser which reads data: 650nm Color of laser: Red