BLUE RAY DISC

Here is a small information about the blue ray disc. firstly we have to know who introduced this blue ray disc in the market. Blue ray disc is developed by Sony. Blue ray disc surpassed storage capacity of DVD disc about 6 times. Blue ray disc is available two different formats. First one single layer has a storage capacity of 25 gigabytes. Other one is Dual layer which has storage capacity of 50 gigabytes. We can store more Data than Dual layer DVD because it uses shorter wave length (405 nanometer). Blue ray disc is available in two different sizes they are standard disc size 12 cm diameter, other one mini size 8 cm diameter.


TYPE 1: STANDARD SIZE DISC

PHYSICAL SIZE : 12 cm

SINGLE LAYER : 25 GB

DUAL LAYER : 50 GB

TYPE 2: MINI SIZE DISC

PHYSICAL SIZE : 8 cm

SINGLE LAYER : 7.8 GB

DUAL LAYER : 15.6 GB

Blue ray disc data layer is near to the disc surface than the DVD disc. So the Blue ray disc has more scratches than any other disc. So they use cartridges for protection. TDK was the first company to work on to reduce the scratches on the Blue ray disc and they succeed. Sony developed a new method for reducing scratches in the disc. The method is spin-coated with a scratch –resistant and antistatic coating.