What is Blu-ray?

The Blu-ray name is a combination of "blue," for the color of the laser that is used, and "ray," for optical ray. The "e" in "blue" was purposefully left out, according to the manufacturers, because an everyday word cannot be trademarked.  Blu-ray or Blu-ray Disc (BD) will be the next generation optical media, was jointly developed by Blu-ray Disc Association (DBA), and a group of the leading consumer electronics manufacture such as Sony, and Philips.  Blu-ray Disc format was developed to fulfill the inevitable technological demands, it enable recording, rewriting, and playback of high definition video (HD), and larger storage for data.  Blu-ray media are capable of storing more than five times as much as a normal single layer DVD, holding about 25 GB of data on a single layer and 50 GB on a double-layer disc.  Furthermore, BDA and the leading consumer electronics group is predicted to release an 8 layers disc, 200 GB, in the near future.  This extra capacity alone can offer consumers with greater and better experiences. 


Blu-ray disc can achieved such capacity is because it uses a blue-violet laser instead of the red laser that is used for DVD.  The key point is that Blue-violet laser has a shorter wavelength (405 nm) instead of the traditional red laser which is 650 nm (illustrated in the picture above).  The shorter wavelength make it possible to focus the laser spot with even greater precision, this allows the data to be packed more tightly and stored in less space physically.  Which in turn store more data in the same amount of physical space.

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