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The DVD uses a different laser with a smaller wavelength, not the long wavelength red laser that is used for CD's. I believe the DVD laser is in the ultraviolet spectrum. Anywho, the smaller laser allows the DVD to have smaller "bumps" (which is what the laser reads). Since they are smaller, more can fit onto a disk. Also, DVD's can be 2-layer. Twice the data.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoThe DVD uses a red laser with a smaller wavelength, not the long wavelength red laser that is used for CDs. The shorter wavelength allows the beam to be more accurate. This accuracy means that more data can be stored on a DVD than a CD. Data can only be written on one side of a CD, but a DVD can be written on both sides depending on the type of DVD (for example, DVD-5) you have.
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Wiki User
∙ 12y agoA DVD laser beam wavelength is shorter than a CD laser beam. The shorter the wavelength the more accurate, which means more data can be stored. Also, a DVD disc can have up to 2 layers per side and the CD disc can only hold data on one side.
Wiki User
∙ 13y agoThe DVD uses a different laser with a smaller wavelength, not the long wavelength red laser that is used for Cd's.
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