Blu-ray, also known as Blu-ray Disc (BD) is the name of a next-generation optical disc format jointly developed by the Blu-ray Disc Association (BDA), a group of leading consumer electronics and PC companies (including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson). The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. A single-layer Blu-ray Disc can hold 25GB, which can be used to record over 2 hours of HDTV or more than 13 hours of standard-definition TV. There are also dual-layer versions of the discs that can hold 50GB.
While current optical disc technologies such as DVD, DVDÂ±R, DVDÂ±RW, and DVD-RAM use a red laser to read and write data, the new format uses a blue-violet laser instead, hence the name Blu-ray. Despite the different type of lasers used, Blu-ray products can easily be made backwards compatible through the use of a BD/DVD/CD compatible optical pickup and allow playback of CDs and DVDs. The benefit of using a blue-violet laser (405nm) is that it has a shorter wavelength than a red laser (650nm), which makes it possible to focus the laser spot with even greater precision. This allows data to be packed more tightly and stored in less space, so it's possible to fit more data on the disc even though it's the same size as a CD/DVD. This together with the change of numerical aperture to 0.85 is what enables Blu-ray Discs to hold 25GB/50GB.
With the rapid growth of HDTV, the consumer demand for recording HD programming is quickly rising. Blu-ray was designed with this application in mind and supports direct recording of the MPEG-2 TS (Transport Stream) used by digital broadcasts, which makes it highly compatible with global standards for digital TV. This means that HDTV broadcasts can be recorded directly to the disc without any quality loss or extra processing. To handle the increased amount of data required for HD, Blu-ray employs a 36Mbps data transfer rate, which is more than enough to record and playback HDTV while maintaining the original picture quality. In addition, by fully utilizing an optical disc's random accessing features, it's possible to playback video on a disc while simultaneously recording HD video.
Blu-ray is expected to replace VCRs and DVD recorders over the coming years, with the transition to HDTV. The format is also likely to become a standard for PC data storage and HD movies in the future.]
Upendra has clearly described a blue rayed disc.
Let me tell u that these discs will be use in playstation 3. U can imagine how vast these games may be n how powerfull graphics ps3 must be having.It uses an Nvidia Graphics with IBM cell processor.Has broadband n wireless.35 times more powerfull then ps2!!!
well lot of hipe is going on between HD=DVD and Blue Ray...more info can b found here..but heard that both Sony and TOSHIBA have reallised after 3 years that its Vain to fight over the standard and are going to develop a Combined format ....If a compromise is reached there are two likely scenarios.
1) The combined format uses Blu-ray's disc structure, but HD-DVD's software. This would likely be Sony's preferred solution.
2) The new disc uses HD-DVD's structure, which is similar to standard DVDs, but uses Sony's multi-layer recording technology. This is thought to be Toshiba's favoured option.