How do Blu-ray Discs Work?

Blu-ray disks are perfect for people who have a lot of data to backup. People usually use DVD/CD’s but now there is something better, the blu ray disks! The blu ray has a very high storage capacity and are able to play back high definition video. They are also able to hold any digital content, data, information and photographs.

A DVD that is normally used can only hold up to 4.7 gigabytes of data, that would be about the size of an average two hour movie, where as a high definition movie that has a clearer picture view would take up about five times the amount of bandwidth and in doing so it would require a disc that has five times the amount of storage space. Play back systems that have a lot of storage capacity like the blu ray are needed in the movie industry especially because movies made through high definition.

You can get two different sizes of blu ray discs, 27 gigabytes and 54 gigabytes, Depending on how much information you need to transfer. The 27 gigabyte disc is the single layer and the 54 gigabyte disk is the double layer disc. 27 gigabytes (the single layer blu ray disc) is more than two hours of video played on high definition and is about thirteen hours of video played on standard. The double layer blu ray disc can store more than four and a half hours of high definition video and more than twenty hours of standard video.

The data on the blu ray is so easily read with no complications because it is placed on top of a 1.1 millimeter thick layer of polycarbonate, this is what prevents birefringence and also prevents scanning and readability problems. It also eliminates the problem of the disc tilting because the recording layer is close to the objective lens of the mechanism that does the reading of the disc. The disc is also protected from fingerprints, marks and scratches!