The BD format was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures.
Besides these hardware specifications, Blu-ray is associated with a set of multimedia formats.
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DVD-Video discs were limited to a maximum resolution of 480p ( NTSC, 720×480 pixels) or 576p ( PAL, 720×576 pixels). High-definition (HD) video may be stored on Blu-ray discs with up to 2160p resolution (3840×2160 pixels) and at up to 60 frames per second.
Triple-layer discs (100 GB) and quadruple-layer discs (128 GB) are available for BD-XL re-writer drives. 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. The plastic disc is Template:Convert in diameter and Template:Convert thick, the same size as DVDs and CDs. The name "Blu-ray" refers to the blue laser (actually a violet laser) used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs. The main application of Blu-ray is as a medium for video material such as feature films and for the physical distribution of video games for the PlayStation 3, PlayStation 4, and Xbox One.
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It was designed to supersede the DVD format, and is capable of storing several hours of video in high-definition (HDTV 720p and 1080p) and ultra high-definition resolution ( 2160p). Blu-ray or Blu-ray Disc ( BD) is a digital optical disc data storage format.
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