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The polycarbonate disc is 120 millimetres (4.7 in) in diameter and 1.2 millimetres (0.047 in) thick, the same size as DVDs and CDs. The name "Blu-ray" refers to the blue laser (which is 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, PlayStation 5, Xbox One, and Xbox Series X.
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It is designed to supersede the DVD format, and capable of storing several hours of high-definition video (HDTV 720p and 1080p). The Blu-ray Disc ( BD), often known simply as Blu-ray, is a digital optical disc storage format.
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Up to four layers are possible in a standard form BD.Ĥ05 nm diode laser with a focused beam using more power than for reading
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Different brands of disc can have different colors, such as silver, gold, or grey.ĭata encoding: CLV or Zoned CAV pits-and-lands with interleaved error correction code Unlike CD and DVD, the reflection has a blue hue.