Does a DVD store data in a similar manner to a CD?
DVDs store data in a manner similar to CDs: microscopic data-storing pits are embedded in a disc during production and, when played, a laser beam reflects light from the surface, detecting pitted areas and converting the information to an electrical signal. CDs and CD-ROMs use an infrared laser to read pits on a disc, while DVD uses a laser that emits light in the shorter red wavelength. This “thinner” beam can read smaller pits, which means more data can be packed on a disc. Additionally, while today’s optical discs use a single layer of encoded information, DVD can use up to four layers. Storage potential also increases due to the fact that each disc can be double sided as a result of a bonding process that seals two 0.6mm discs back to back.
DVD stores data in a manner similar to CDs: Microscopic data-storing pits are embedded in a disc during production and, when played, a laser beam reflects light from the surface, detecting pitted areas and converting the information to an electrical signal. CDs and CD-ROMs use an infrared laser to read pits on a disc, DVD uses a laser that emits light in the shorter red wavelength. This “thinner” beam can read smaller pits, which means more data can be packed on a disc. Additionally, while today’s optical discs use a single layer of encoded information, DVD can use up to four layers. Storage potential also increases due to the fact that each disc can be double sided as a result of a bonding process that seals two 0.6mm discs back to back.
