what is the difference between cd & dvd ?
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Answer Posted / arvind kumar
SPEG CD DVD
Diameter 12cm 12cm
Thickness 1.2mm 1.2mm
Numerical Aperture 0.60 0.38 to 0.45
traise pitch 1.6mm 0.75Um
capasity 700mb 4.7gb
ratation speed 200-500 rpm 570-1600 rpm
modulation 8/14 8/16
user data rate 1.41mbps 11.08mbps
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