Blu Ray Disks:
Blu-ray
Disc (BD), often known simply as Blu-ray,
is a digital optical disc storage format. It is designed
to supersede the DVD format, capable of storing several hours of
video in high-definition (HDTV
720p and 1080p). 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.
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
plastic disc is 120 millimetres (4.7 inch)
in diameter and 1.2
millimetres (0.047 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 progressive or 50/60 interlaced frames per
second. DVD-Video discs were limited to a maximum resolution of 480i
(NTSC, 720×480 pixels) or 576i (PAL, 720×576 pixels). Besides these hardware
specifications, Blu-ray is associated with a set
of multimedia formats.
The BD
format was developed by the Blu-ray
Disc Association, a group representing makers of consumer electronics,
computer hardware, and motion pictures. Sony unveiled the first Blu-ray Disc prototypes in October
2000, and the first prototype player was released in Japan in April
2003. For playback of 4K content, the BDA introduced a variant of Blu-ray called Ultra HD Blu-ray.
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