Blu-Ray Discs – An introduction

What is Blu-ray?

Blu-ray is the advanced storage technology, which helps to store a huge amount of data in a disc than all the present storage disc technologies. In the present DVD’s we can store just upto 25GB and with this Blu-ray technology, the storing capacity raises to 50GB to 500GB capacity. The advancement is that the Blu-ray uses the optical disc technology to store the data in which the datas can be stored for a long period of time than the present DVD’s and CD’s. With the same dimensions of the present CD’s and DVD’s, the Blu-ray discs(BD) are slowly getting through the market value.

How came the name Blu-ray?

The standard CD’s uses the wavelength of infrared rays to read or write any data (780nm). The DVD’s uses the wavelength shorter than the infra red rays, around 650nm to read or write any data. But, as the Blu-ray discs use the wavelength more shorter and sharper than this, nearly 405nm wavelength, which is the wavelength of the blue violet-laser light, the discs are called as Blu-ray discs. The Blu-ray discs emerged from the word Blue-ray. Shorter the wavelength, higher will be the reading/writing speed and larger will be the disc storage capacity. So, the Blu-ray discs allow nearly five times a larger storage capacity to that of a normal DVD. At present, Blu-ray discs have a maximum, dual-layer storage capacity of 50GB.


With more than five to six times greater storage, the discs can be stored with the longer movies with the wonderful clarity and good resolution. The storage problems of the long time videos comes to an end. Another one advantage of these disks are that they comes with a hard coating layer, which are almost vulnerable to scratches.

Blu-ray developer-Blu-ray Disc Association (BDA)

The Blu-ray was developed by the Blu-ray Disc Association (BDA) which is currently signed in link with than 200 of the leading consumer electronics, personal computer, and media manufacturers that include, Pioneer Sharp, Apple, Dell, HP, Thomson Multimedia, Walt Disney Pictures, Warner Bros. Entertainment, Sony and Samsung.

Comparison between DVD and Blu-ray Disc

In early 1980’s the floppy discs were the great storage mediums, which were slowly replaced by the CD’s in late 1990’s. The CD’s too started to loose its values with the replacement by DVD’s in 2000. The Blu-ray discs with its improved storage capacity will surely replace all the existing DVD’s says a technological report.

Types of Blu-ray discs

a)Mini Blu-ray Disc

The Mini Blu-ray Disc (also, Mini-BD and Mini Blu-ray) is a compact 8 cm (~3in)-diameter which is a variant of the Blu-ray Disc.It can store approximately 7.5 GB of data. It is similar to the MiniDVD and MiniCD. Recordable (BD-R) and rewritable (BD-RE) versions of Mini Blu-ray Disc are also available.

b)Recordable Blu-ray Disc

BD-R discs can be written to once, whereas BD-RE can be erased and re-recorded multiple times. It is also similar to read/write CD’s and DVD’s.

Blu-ray Players

There are variety of Blu-ray players which are designed by many companies like SONY, SAMSUNG,SHARP and so. These players also have the in-built option to play all the CD and DVD disks too.The technological advancements are being under innovation to make these players more developed. Let us wait for them…

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