

Blu-ray discs get their name from blue laser technology. The
shorter wavelength of the laser is the reason it is blue in colour.
The blue laser has a wavelength of 405nm compared with the
wavelength of 650nm for DVD which utilises red laser technology.
The benefit of having a blue laser with a shorter wavelength means
it is possible to write smaller data pits and therefore vastly
increase the amount of data on the disc
Blu-ray discs offere 3 to 5 times the storage capacity of a
standard recordable DVD disc, enabling the recording, rewriting and
playback of high definition video (HD).

