It is an optical storage medium designed to store large
amount of data as compare to DVD. It uses the blue laser that allows
information to be stored at a greater density as compare to red laser used in
DVD. It is because the red laser has a longer wavelength. It is associated with
a multimedia forest that allows the data to be stored with a greater definition
than on DVD.
The first blue-ray disk was released on June 20, 2006. Blue ray
laser uses a 405 NM blue laser diode while a DVD uses 650 NM red lasers. The smaller
beam focuses more precisely that’s why blue ray disk stores more data than the DVD.
The conventional blue ray disk contain 25 GB data with one layer after that
blue ray disk comes with double layer that contains 50 GB, then 100 GB with
triple layer and 128 GB with quadruple layers. Now a days leading manufacturers
of blue ray disk are Apple, Dell, Hitachi, HP, JVC, LG, Panasonic, Philips,
Samsung, Sharp, Sony, TDK and Thomson.
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