Blu-ray Discs. What Are The Advantages Of The New Format?
Media data were changing many times in the entire history of mankind: first, it was the wall in the caves, then wooden plates, then papyrus and paper, then people began to record music on records, the reel tapes, cassettes.
A few decades ago with the advent of the computer age digital media appeared: floppy disks, video tapes and discs: CD, and then DVD. DVD is now at the peak of its popularity, and soon it will be replaced by the new technology Blu-ray, which has already gained a professional film sphere and slowly but surely comes into the life of ordinary people.
Let’s start from the beginning. In 2006, a new model called Blu-ray was first presented at the international exhibition of electronics. It is derived from two English words, “blue” and “ray” and it is blue-violet laser used to read and write these discs. At first, a serious competitor to Blu-ray format was HD DVD, but in early 2008, it was taken out of production due to the lack of competitiveness, because many major studios were abandoned of it. At the moment, virtually all film companies use the Blu-ray Discs to store records.
You are probably wondering how much information is placed in them and what kinds of them are? There are single-and dual-layer disks, the amount of discs ranging from 23 to 66 GB. But new four- layer to 100 GB and eight- layer to 200 GB have already being developed. Small-format discs (80 mm) for digital camcorders are also produced.
What besides the volume they differ from the regular DVD? The difference lies in the lasers that are used for read-write disks. DVD and CD use red lasers with a wavelength of 650 or 780 nm, while for Blu-ray discs a blue laser (405 nm) is used, due to what the new format of the track width has been halved and the recording density increased several times.
The speed of reading the disc – up to 432 Mbps (or 54 MB / sec) had also been increased. At this speed our usual DVD would be copied to a computer in just a minute and a half. Another advantage of Blu-ray over DVD is the new cover “Durabis”. This coating is much stronger than that of DVD, and allows you to clean the disc with a paper napkin, and it resists scratches much better.
Yes, the merits of a new drive is enough, but the shortcomings have not yet discovered (of course unless if not considered the high price of the disks themselves and the players for their play, but I think over time the drives will be also available as now DVD ). Also the new schemes for data encryption and copyright protection should be mention which, according to the developers cannot be cracking and therefore probably you can’t so just copy the movies from the neighbors, as we do now on DVD.
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