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A single-Layer BD has storage capacity of 25GB, while a dual-laBlu-rayDisc (also known as Blu-ray or BD) is an optical disc storage mediaformat. It is mainly used in high-definition video and data storage.Blu-ray Disc has the same physical dimensions as a standard DVD orCD. Asingle-Layer Blu-ray has storage capacity of 25GB, while a dual-layerBD can store up to 50GB of data. As the name suggests, a blue-violetlaser is used to write data on a Blu-ray disk, unlike the traditionalmethod wherein red laser employed to store data on DVDs.ABlu-ray disk can hold 9-hour high definition video andstandard-definition (SD) video that can run 23 hours, on a 50GB disk.The BD-ROM movies will require a rate of MBPS for data transfer, sothe expected speed is 2x (72 Mbps). There is also a scope for havingmuch higher speed because of the larger numerical aperture (NA)adopted by the BD. It implies that a Blu-ray disk will need lessrecording power and lower disk rotation speed vis-à-visconventional DVDs and HD DVDs. The sole limiting factor for blu-rayis the capacity of the hardware.Thestorage capacity of Blu-ray disk (BDs) is five times that ofconventional DVDs. BDs supports NPEG-2, MPEG-4 AVC and SMPTE VC-1formats (codecs).Blu-rayDisc uses a "blue" (technically violet) laser operating ata wavelength of 405 nm to read and write data. Conventional DVDs andCDs use red and near infrared lasers at 650 nm and 780 nmrespectively. Theblue-violet laser's shorter wavelength makes it possible to storemore information on a 12 cm CD/DVD sized disc. The minimum "spotsize" on which a laser can be focused is limited by diffraction,and depends on the wavelength of the light and the numerical apertureof the lens used to focus it. By decreasing the wavelength,increasing the numerical aperture from 0.60 to 0.85 and making thecover layer thinner to avoid unwanted optical effects, the laser beamcan be focused to a smaller spot. This allows more information to bestored in the same area. For Blu-ray Disc, the spot size is 580 nm Inaddition to the optical improvements; Blu-ray Discs featureimprovements in data encoding that further increase the capacity.Engineering Services
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