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.
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.
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.
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