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The Blu-ray technology has for the introduction of discs with a high storage capacity in order to meet the increasing demand caused by the rapid growth of the High Definition Television (HDTV) was triggered.The name of the Blu-ray discs is derived from the blue laser technology. The shorter laser wavelength leads to a blue light beam. While DVD media with the red-laser technology at 650 nm wavelength can be read, the blue laser a wavelength of 405 nm. The advantage of a blue laser with a shorter wavelength is that smaller data pits can be written and thus the amount of data on the disc is increased.Blu-ray discs offer three to five times as much storage space as conventional writable DVDs, so that even the high-resolution videos (HD) are recorded, played back and can be overwritten.This text is machine translated.