Blu-Ray Disc

Blu-Ray Disc is the name of the new storage devices that looks like CD and DVD’s but it has more capacity in it.

Blu-Ray Disc was developed by BDA (Blu-ray disc association) and it finished in 2005. The BDA itself consist of many big companies that works together like Apple, Dell, LG, HP, and etc. They was working to made a new method of the storage devices. Before Blu-ray disc, we usually use CD’s or DVD’s that relying on red laser to read or write data. On blu-ray disc, they uses blue-violet lases instead, hence it’s name is blu-ray. The advantage of using a blue-violet laser (405nm) is that it has a shorter wavelength than a red laser (650nm), which makes it possible to focus the laser spot with even greater precision. This allows data to be packed more tightly and stored in less space, so it's possible to fit more data on the disc even though it's the same size as a CD/DVD. This together with the change of numerical aperture to 0.85 is what enables Blu-ray Discs to hold 25GB/50GB. Pioneer has recently pushed the storage capacity to 500GB on a single disc by using 20 layers.

 

 

here is a movie that i got from youtube about blu ray.

nowadays, blue ray become more popular because it provide us a huge storage space that means we can get better quality of movie or data that we want to save. The blu-ray disc was recently used in PS3 console, new movies, etc.

here are some link that provide me the sources

http://us.blu-raydisc.com/#/pages/home

http://en.wikipedia.org/wiki/Blu-ray_Disc

http://www.blu-ray.com/info/