Blu-ray Disc (BD) is a digital optical disc data storage format designed

to supersede the DVD format, in that it is capable of storing high-

definition video resolution (1080p). The plastic disc is 120 mm in

diameter and 1.2 mm thick, the same size as DVDs and CDs. Conventional

(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 layers (128 GB) are available for BD-XL

re-writer drives. The name Blu-ray Disc refers to the blue 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

major application of Blu-ray Discs is as a medium for video material such

as feature films and physical distribution of video games for the

PlayStation 3, PlayStation 4 and Xbox One. Besides the hardware

specifications, Blu-ray Disc is associated with a set of multimedia

formats. These formats allow for the option of video and audio to be

stored with greater definition than on DVD.