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Technology has been improving at a very fast pace and one of the latest technological inventions is the disc which is an optical disc format. Data reading and writing is done by operating it in a 405nm short wavelength blue-violet laser. Data storage capacity is very large in this case.
It forms a technology platform. High quality audio and video being the special features, data is stored in the form of small sized ridges on the surface of an opaque substrate on which there is a transparent protective layer. Copyright protection may be enabled inside the recording streams.
Blue-ray Disc takes the DVD technology one step further just by using a laser with a blue-violet colour. This laser operates in the blue region of visible spectrum. With the advent of Blu-ray Disc, the only format that offers a considerable increase in storage capacity with its 25 to 50 GB data capacity.