Why is Blu-ray the way ahead..

The name Blu-ray is derived from the blue-violet laser it uses to read
and write to the chalcogenide disc. A Blu-ray Disc can store
substantially more data than a DVD, because of the shorter wavelength
(405 nm) of the blue-violet laser (DVDs use a 650-nm-wavelength red
laser and CDs an infrared 780 nm laser), which allows more information
to be stored digitally in the same amount of space. In comparison to HD
DVD, which also uses a blue laser, Blu-ray has more information
capacity per layer (25 gigabytes instead of 15)..
for more on this revolutionary technology:
http://askwiki.blogspot.com/2006/09/...eneration.html

Enjoy !

kushu