Blu-Ray Disks

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INTRODUCTION(contd)
A single-layer Blu-ray disc, which is roughly the same size as a DVD, can hold up to 25GB of data -- that's more than two hours of high-definition video or about 13 hours of standard video.
A double-layer Blu-ray disc can store up to 50 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video.
Users will be able to connect to the Internet and instantly download subtitles and other interactive movie features.
HISTORY
1st GENERATION:
Compact disc (CD): --- 650/700 MB
It is with us for over 20 years.
Wavelength of laser which reads data: 780 nm
Color of laser: Red
2nd GENERATION:
Digital versatile disc (DVD): --- 4.7 GB
It offers high quality sound and video than CD.
Wavelength of laser which reads data: 650 nm
Color of laser: Red
3rd GENERATION:
Blue-ray disc (BD): --- 25/50 GB
Developed by blue-ray disc association (which includes Apple, Hitachi, HP, LG, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony)
Wavelength of laser which reads data: 405 nm
Color of laser: Blue-violet which was developed by
SHUJI NAKAMURA
at NICHIA CORPORATION
Java
Java is used to implement interactive menus on Blu-ray Discs, as opposed to the method used on DVD video discs.
Inclusion of a Java Virtual Machine, as well as network connectivity in some BD devices, will allow updates to Blu-ray Discs via the Internet, adding content such as additional subtitle languages and promotional features not included on the disc at pressing time.
This Java Version is called BD-J
Most Blu-ray Discs that have BD-J menus do not allow a Blu-ray Disc player to automatically resume a movie from the point at which it was stopped.
Future
Expect the BD to become more prevalent once the HDTV market establishes its presence.
Audio and video will reach higher qualities with larger storage space.
Look for BD with more than two layers as the technology is further refined.
CONCLUSIONS
More capacity, Density and Performance
More Industry Support/Consumer Reach (BDA has 140+ members)
More Durable
More Interactive User Experience
More Flexible Content Protection: AAC, BD+ Renewability Technology and ROM Mark