Not who is not a secret that history began with the records. Keep information at home is problematic, and kept it audio only. The principle of operation is no secret, as vinyl disc were popular over a hundred years, and still collectors and DJs use and store them. It was fun to watch the needle while rotating the disk, was shaking like a perfectly smooth spiral. this was how produce the sound. When you change the depth and width of the groove is changed by a sound wave, and further reinforced pipe (gramophones, gramophones). With the development of electronics, the principle of the removal of the information, was placed on a piezoelectric needle and got a modern, not long ago, a record player is.
That came 70 years. And there was a jump in media (magnetic tapes we miss). Invented the disc made of polycarbonate, has a transparency, with an aluminum coating. Polycarbonate was used as a basis and protect the coating from external influences, and the coating of the spiral was burnt recess. The principle of withdrawal and record information and based on this, as you can see not far away from records. A thin beam is reflected from the surface of the deposition came to light receiver which, in turn, determined the changes relative to the information received, created ones and zeros. And then on the principle of the alphabet Morse information is converted into music, movies, pictures, files, etc.
Now let us examine the symbols on CDs:
But with DVD discs, all came together much more difficult. This disc was created to store information in a large volume and has been developing a large number of firms (DVD-R and DVD-RW). Different spraying had the most varied characteristics and household players, different companies have started to interfere with the discs, hence the lost versatility. So unite, have invented a new type of disk, called DVD+R and DVD+RW, they are, oddly enough, cheaper. Now no matter what disk to use, as domestic players have adapted. There is a difference only in overwriting disks, DVD-RW must be fully erased prior to recording and DVD+R it is sufficient to erase a header and put the entry on top.
As they say, as we do not let and we are all a little. This progress did not stop there, bilateral and bilayer and two-in-one discs. Well, with bilateral, the coating was applied from both sides, and as an audiocassette need to flip the disc. Bilayer is one of the nearest to the laser of layers made semi-transparent, and stand up from the couch to flip the disc does not need. Well, last option, take two bilayer and glue together.
Here we reached the peak of development of the modern world CD-ROM, is a HD-DVD and Blu-ray . br> HD-DVD is the disk, which is made on the basis of our hardworking, described above, but use a blue laser. br> Blu-ray - a totally different design, uses a blue laser.
If you recall the spectrum (the rainbow), it will be seen that with blue ray, you can get a much thinner beam, so these wheels are much bigger happened. But this will be in the next topic.
Like, today, everything. it Remains only a little about the storage and usage of your disk to tell. Drive is not tasty to chew it is not necessary, well if only someone lack of plastic in the body. And it is not a tool for the game on the nerves, this is not necessary claws to drive over it. it is Advisable not to stick, though, and breaks down difficult, but the pieces can get where you should not, and it will affect your body. Constant bending breaks, which is inside the coating, it cracks and zeros of the unit no longer will you have to be the same. The sun it roast he D does not need, and to become zobrazeny product and no where to shove. Drive with a crack in the drive does not insert, but otherwise have spent on either repair or purchase a new one.
I hope YOU literate and you don't need all the points list, things should be treated carefully and they YOU will thank you.