The polycarbonate disc is 12 centimetres ( 4 + 3⁄ 4 inches) in diameter and 1.2 millimetres ( 1⁄ 16 inch) thick, the same size as DVDs and CDs. Conventional (or "pre-BD-XL") Blu-ray Discs contain 25 GB per layer, with dual-layer discs (50 GB) being the industry standard for feature-length video discs. Triple-layer discs (100 GB) and quadruple-layer discs (128 GB) are available for BD-XL re-writer drives. High-definition (HD) video may be stored on Blu-ray Discs with up to 1920 × 1080 pixel resolution, at 24& 50/60 progressive or 50/60 interlaced frames per second. DVD discs were limited to a maximum resolution of 480 ( NTSC, 720×480 pixels) or 576 lines (CCIR 625/50, 720×576 pixels, commonly used with PAL). The BD format was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures.īesides these hardware specifications, Blu-ray is associated with a set of multimedia formats. Sony unveiled the first Blu-ray Disc prototypes in October 2000, and the first prototype player was released in Japan in April 2003.
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