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  • Phonograph plays by physical contact between record groove and sharp stylus.
  • CD plays using laser light reflected from pits in concentric tracks on metal film embedded in transparent plastic disc.
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Q: What is the difference between a phonograph and CD's today?
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What is all the difference between a CD and DVD?

CDs are for music while DVDs are for movies


This may be dumb but what is the difference between CD's?

Some CDs have music, some have games, and some have pictures.


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What is the difference between CDs and VHS?

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