Blu-ray
Blue-laser optical disc format that succeeded DVD for HD video.
Blu-ray, also called Blu-ray Disc or BD, is a digital optical disc format that was created to replace DVDs. Developed during the early to mid-2000s, it launched globally on June 20, 2006, and can hold several hours of high-definition video, including 1080p. The format gets its name from the blue laser that reads the disc; this laser’s shorter wavelength allows data to be packed more tightly than the red laser used in DVDs, giving Blu-ray greater storage capacity. Its main uses are for video content like movies and for distributing video games on consoles such as the PlayStation 3, 4, and 5, as well as the Xbox One and Xbox Series X. The disc itself is made of polycarbonate, measures 12 centimeters across and 1.2 millimeters thick—the same size as CDs and DVDs. Standard Blu-ray discs (not BDXL) hold 25 GB per layer, with dual-layer discs of 50 GB being the norm for feature-length films. BDXL is a read-only and write-once format supporting triple-layer discs of 100 GB and quadruple-layer ones of 128 GB; rewritable BD-RE XL discs exist but are not typically associated with BDXL drives. While DVD-Video maxes out at 480p (NTSC) or 576p (PAL), the original Blu-ray movie specification allowed up to 1080p (1920×1080 pixels) at 24 progressive or 29.97 interlaced frames per second. Later updates let some players handle 1440×1080 video, and Ultra HD Blu-ray players pushed the ceiling to 4K (3840×2160) at up to 60 progressive frames per second. An 8K (7680×4320) Blu-ray format exists only in Japan; other non-standard video resolutions must use letterboxing to fit within supported specs. Since Blu-ray discs can also store ordinary computer files, there is no hard limit on video resolution when not following official guidelines. The format was developed by the Blu-ray Disc Association, a group of consumer electronics, computer hardware, and movie industry companies. Sony showed the first prototypes in October 2000, and the first player went on sale in Japan in April 2003. Development continued until the worldwide launch on June 20, 2006, kicking off the high-definition optical disc format war against HD DVD. Toshiba, HD DVD’s main backer, dropped that format in February 2008 and later released its own Blu-ray player in late 2009. According to Media Research, high-definition software sales in the U.S. grew more slowly in the first two years than DVD software sales had. Blu
- field
- Digital optical disc data storage
- known_for
- Superseding DVD as the primary medium for high-definition video and physical video game distribution
- release_date
- June 20, 2006
- developed_by
- Blu-ray Disc Association (BDA)
- capacity
- 25 GB per layer (single-layer), 50 GB (dual-layer), up to 128 GB (BDXL quadruple-layer)
- laser_wavelength
- 405 nanometers
Lore & Background
The Blu-ray 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. 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. Toshiba, the main company supporting HD DVD, discontinued the format in February 2008, and later released its own Blu-ray Disc player in late 2009.
The first BD-ROM players (Samsung BD-P1000) hit the U.S. market on June 20, 2006, with a launch lineup that included titles like *50 First Dates* and *The Terminator*—wait, scratch that. Actually, neither *The Terminator* nor *50 First Dates* were among the first Blu-ray titles released on that initial launch date. *50 First Dates* didn't arrive until later in 2006, and *The Terminator* wasn't a launch title either. So if you heard those were day-one releases, that's a myth—the actual launch slate was different, but those two flicks definitely weren't on it.
Reader's Guide
Blu-ray's significance lies in its role as the successor to the DVD format, enabling high-definition video (up to 1080p initially, later 4K and 8K in some regions) and greater storage capacity through the use of a blue laser. It became the standard physical medium for feature films and video games on major consoles including PlayStation 3, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X. The format won the high-definition optical disc format war against HD DVD, which Toshiba discontinued in February 2008. Despite its technical advantages, Blu-ray faced slower adoption than DVD in its first two years, and later faced competition from video on demand (VOD) and DVD. The format's specifications allowed for multiple layers (up to 128 GB in BDXL) and supported various video resolutions and codecs. Its legacy includes establishing a DRM system (AACS) and enabling the distribution of high-definition content in physical form.
Did You Know?
- The name 'Blu-ray' refers to the blue laser used to read the disc, which operates at a wavelength of 405 nanometers.
- The first consumer Blu-ray device was the Sony BDZ-S77, a US$3,800 BD-RE recorder released only in Japan on April 10, 2003.
- TDK developed an ultra-hard polymer coating called Durabis for Blu-ray Discs, announced in January 2005, which eliminated the need for protective cartridges.
- The first Blu-ray Disc titles were released on June 20, 2006, including 50 First Dates, The Fifth Element, and The Terminator.
Frequently Asked Questions
What is Blu-ray and who put it together?
Blu-ray is a high-capacity optical disc format built to replace DVD for high-definition content. It was developed by the Blu-ray Disc Association and rolled out globally on June 20, 2006.
Why is it called 'Blu-ray'?
The name refers to the 405-nanometre blue-violet laser that reads the disc surface. That shorter wavelength lets data pits sit closer together than on a red-laser DVD, which is the whole reason the format can store more.
How much can a single Blu-ray disc actually hold?
A standard single-layer disc carries 25 GB, a dual-layer disc 50 GB, and the BDXL quadruple-layer version stretches to 128 GB. In practice that means several hours of 720p or 1080p video on one disc.
What do people actually use Blu-ray for?
It is the go-to physical medium for high-definition movie releases and for shipping video games on consoles such as the PlayStation 3 and PlayStation 4.
Why did Blu-ray end up replacing DVD instead of the other way around?
The blue laser's shorter wavelength made it the only optical format with enough raw capacity for full HD video. That storage edge made it the natural next step once the market shifted from standard to high definition.
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