2007-03-21 02:04:36 · 3 answers · asked by Lovely B 3 in Consumer Electronics ➔ Other - Electronics
A Blu-ray Disc (also called BD) 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 DVD format, which uses a red, 650 nm laser. Blu-ray Disc can store 25 GB on each layer, as opposed to a DVD's 4.7 GB. Several manufacturers have released single layer and dual layer (50 GB) recordable BDs and rewritable discs.
Blu-ray Disc is similar to PDD, another optical disc format developed by Sony (which has been available since 2004) but offering higher data transfer speeds. PDD was not intended for home video use and was aimed at business data archiving and backup.
Blu-ray Disc is currently in a format war with rival format HD DVD.
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 dual layer disc will extend this number up to 3 hours in HD quality and 9 hours of SD bonus material.
2007-03-21 02:12:50 · answer #1 · answered by Vlado 4 · 2⤊ 0⤋
blueray is a new technology which fits more data on a disc. it's a kind of High Density DVD, so it won't replace the dvd player but will probably will become the new dvd player of choice.
learn more about it at howstuffworks.com
2007-03-21 02:14:44 · answer #2 · answered by Ksyrium 3 · 0⤊ 1⤋
excellent answer from Vlado, the best information I've seen in answers , for this question thank you sir
2007-03-21 02:16:58 · answer #3 · answered by jim m 7 · 1⤊ 0⤋