The optical storage industry is transitioning from lower density red lasers to higher density blue lasers.New blue laser advantage of the shorter wavelength offered by blue lasers to dramatically
increase media capacity.Blurays use 405 nm laser, while DVDs use a 650-nm-wavelength red laser and CD's 780 nm.
With the TDK releasing its 200GB today Blu-ray Disc has added another weapon to the optical storage segment.
As an archive technology, though an optical storage has faster access times than tape and is cheaper than magnetic disk and being cheaper it has failed to conquer the professional environment ,rulez only the entertainment martket (audio,video,game).
There is a long way for the discs to catch up the disks !!!

