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To the naked eye they are not really that different at all, they are both the same physically and they are manufactured in the same way. The real difference is the "Pits, Landings, and Optics (Dyes)" and the spacing between them. CD's have large spaces between the pits or grooves (where the information is stored, about like an old LP Record) where DVD's have much smaller spaces between them (look at a course thread bolt and a fine thread bolt to understand the differences - but much smaller of course). Dyes also play an important part as they affect the optical reflection of the laser, and contribute to the longevity of the media.

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Q: Is there any physical difference between CD-rom and DVD?
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