what is a blu-ray disk??

BluRay is a special type of DVD that is read by a blue laser versus a red laser, hence the name. It can store up to 50GB, which is enough storage capacity to store movies in high definition recorded in 1080p, compared to the old DVD's that store up to 9.4GB and only 480p.

BluRay has more storage, high resolution video and theoretically better sound. You will need an expensive $500 BluRay DVD player to read the discs and an HDTV to fully take advantage of the benefits.

BluRay players will be able to play standard DVD's, but standard DVD players cannot play BluRay discs. A Blu-ray Disc is a high-density optical disc format for the storage of digital media, including high-definition video. The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc. Because of this shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the common DVD format, which uses a red, 650 nm laser. In comparison to HD DVD, which also uses a blue laser, Blu-ray Disc has more information capacity per layer (currently 25 GB, but test media is up to 33 GB). Several manufacturers have released 50 GB recordable BDs and rewritable discs. All supporting studios have either already released or have announced release of movies on 50GB discs. The Blu-ray Disc standard was jointly developed by a group of consumer electronics and PC companies called the Blu-ray Disc Association (BDA). The BDA announced its intent to release discs and players in the first quarter of 2006 at the Consumer Electronics Show (CES) in January 2006; Sony Pictures Entertainment and several other members later announced a planned launch date of May 23, 2006; however, most did not meet this date and product launches were instead spread out over the rest of 2006. About 9 hours of high-definition (HD) video can be stored on a 50 GB disc. About 23 hours of standard-definition (SD) video can be stored on a 50 GB disc. On average, a single-layer disc can hold a High Definition feature of 135 minutes using MPEG-2, with additional room for 2 hours of bonus material in standard definition quality. A double-layer disc will extend this number up to 3 hours in HD quality and 9 hours of SD bonus material.

The answers post by the user, for information only, CeQnA.com does not guarantee the right.