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While current optical disc technologies such as DVD, DVD±R, DVD±RW, and DVD-RAM rely on 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 with CDs and DVDs through the use of a BD/DVD/CD compatible optical pickup unit. 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.
Blu-ray is currently supported by more than 180 of the world's leading consumer electronics, personal computer, recording media, video game and music companies. The format also has broad support from the major movie studios as a successor to today's DVD format. In fact, seven of the eight major movie studios (Disney, Fox, Warner, Paramount, Sony, Lionsgate and MGM) have released movies in the Blu-ray format and six of them (Disney, Fox, Sony, Warner, Lionsgate and MGM) are releasing their movies exclusively in the Blu-ray format. Many studios have also announced that they will begin releasing new feature films on Blu-ray Disc day-and-date with DVD, as well as a continuous slate of catalog titles every month.
Category: HD DVDBlu Ray - The History was written by:Author:Paul CollinsAdded: Sat, 31 May 2008 07:03:04 -0400 This Article Has Been Read 139 times View all Paul Collins's articlesAbout the Author: Paul is a very succesful businessman and diversed into many things throughout his career, As Business Developement and Marketing Manager, Paul managed all aspects of controlling over 100 retail units in the U.K. Very much involved with Franchising and Business opportunities, always willing to help and advise, Paul has helped many people on the road to starting there own businesses. Paul has also owned and run succesful retail units, franchises and printing Companies, the most recent project was overseeing and advising on a expansion of a local magazine Paul is also a very succesful Internet marketer and has made money from several projects on the internet. http://merrychristmas-presents.blogspot.com/ |
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