The Blu-ray disc system uses a shorter wavelength than conventional optical discs (CD systems use a red laser with a wavelength of 780 nanometers whereas DVD systems use the same red laser with a wavelength of 650 nanometers). The shorter wavelength means more precise data recording, which allows more data to be packed on the Blu-ray disc surface than a comparable CD or DVD surface. In fact, a standard single-layer Blu-ray disc can store as much as 25 GB of digital data, more than five times the storage capacity of conventional DVDs.
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