Jinan Blue Box Technology to explain the difference between DVD discs and CD discs

Jinan Blue Box Technology Professional DVD disc production CD pressing CD printing. 1, from the technical point of view DVD is the desired data is stored in the optical disk in a very small groove track, and then through the drive laser beam to read the work. But in density optical disc, DVD larger than VCD, DVD data thus read when you need a shorter wavelength than the data read VCD laser beam. Because the only way to be able to make more precise laser beam focus and position above the disc. The minimum pit length CD is 0.834μm, a track pitch of 1.6μm, with a wavelength of 780 ~ 790nm infrared laser to read data, and the minimum pit length DVD only 0.4μm, track pitch of 0.74μm, a wavelength of 635 ~ 650nm infrared laser to read data. Jinan Blue Box Technology Professional DVD disc production CD pressing CD printing. 2, when playing video VCD only up to standard 240 lines, while a standard DVD can be up to 720 lines, and therefore clarity, DVD occupy an absolute advantage. 3, the data capacity of CD / VCD can hold about 650MB-700MB of data, while DVD can hold 4.7GB of data a minimum. Press the single / double-sided and single / double-layer structure of various combinations, DVD can be divided into single-sided single-layer, single-sided double-layer, single-sided and double-sided double-layer four physical structure. Sided single-layer DVD disc capacity of 4.7GB (about seven times the capacity of CD-ROM), double-sided double-layer DVD disc capacity and up to 17GB (about 26 times the capacity of CD-ROM). Jinan Blue Box Technology specializes in CD burning, CD printing, CD pressing, CD-ROM production, CD packaging, CD / DVD production and CD printing, offset printing, packaging, CD packaging protective film provides a range of services!