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A trademark for the 'Blue Disc' logo was filed on February 9, 2001. The first DVR Blue prototypes were unveiled by Sony at the CEATEC exhibition in October 2000. The core technologies of the formats are similar. Sony started two projects in collaboration with Panasonic, Philips, and TDK, applying the new diodes: UDO (Ultra Density Optical), and DVR Blue (together with Pioneer), a format of rewritable discs that would eventually become Blu-ray Disc (more specifically, BD-RE). Following protracted development, blue laser diodes operating at 405 nanometers became available on a production basis, allowing for development of a denser storage format that could hold higher-definition media, with prototype discs made with diodes at a slightly longer wavelength of 407 nanometers in October 1998. The information density of the DVD format was limited by the wavelength of the laser diodes used. Kees Schouhamer Immink received a personal Emmy award for his pioneering contributions to the DVD and the Blu-ray Disc.

3.8.1 High-bandwidth Digital Content Protection.

For playback of 4K content, the BDA introduced a variant of Blu-ray called Ultra HD Blu-ray. broadband households had a Blu-ray player. Blu-ray faces competition from video on demand (VOD) and the continued sale of DVDs.

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According to Media Research, high-definition software sales in the United States were slower in the first two years than DVD software sales. Toshiba, the main company supporting HD DVD, conceded in February 2008, and later released its own Blu-ray Disc player in late 2009. Afterward, it continued to be developed until its official worldwide release on June 20, 2006, beginning the high-definition optical disc format war, where Blu-ray Disc competed with the HD DVD format. Sony unveiled the first Blu-ray Disc prototypes in October 2000, and the first prototype player was released in Japan in April 2003.

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. DVD-Video discs were limited to a maximum resolution of 480i ( NTSC, 720Р“вЂ”480 pixels) or 576i ( PAL, 720Р“вЂ”576 pixels).

High-definition (HD) video may be stored on Blu-ray Discs with up to 1920Р“вЂ”1080 pixel resolution, at 24 progressive or 50/60 interlaced frames per second. Triple-layer discs (100Р’В 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 (50Р’В GB) being the industry standard for feature-length video discs. The polycarbonate disc is 120 millimetres (4.7Р’В in) in diameter and 1.2 millimetres (0.047Р’В 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.

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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.

High-Definition Versatile Multilayer Disc (HD VMD).

HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM.

Blu-ray Disc ( BD): BD-R & BD-RE, Blu-ray 3D, Mini Blu-ray Disc.

DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-R DS, DVD+R DS, DVD-RW, DVD+RW, DVD-RAM, DVD-D, DVD-A, HVD, EcoDisc, MiniDVD.

Compact disc ( CD): CD-DA, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, Super Audio CD ( SACD), Photo CD, CD Video ( CDV), Video CD ( VCD), Super Video CD ( SVCD), CD+G, CD-Text, CD-ROM XA, CD-i, MIL-CD, Mini CD.

Up to four layers are possible in a standard form BD.Р”В¤05Р’В 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.Р”Вata 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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