Does the disc have magnetic material?
According to the structure of optical disk, CD is mainly divided into CD, DVD, Blu ray discs and so on. These types of discs are different in structure, but the main structure principle is consistent. There are no differences in structure between read-only CD discs and recordable CD discs. They are mainly distinguished from the application of materials and the differences of some manufacturing processes, and the same is true of DVD.
CD, DVD disc is photoelectric recording method, which is used in laser beam on the disc, using light intensity of concave holes with different reflection on the disc, to read the information. Disposable recording CD-R disc (MPC) mainly used organic dyes, when the CD in the burn, the laser will on a substrate coated with organic dyes, direct burn, burn a "pit", which is "the pit" and not "pit" state form "signal 0'and 1'," this one "pit" can not reply, when firing "pit", will be permanently maintain the status quo, this also means that the disc cannot erase duplication. This series of "0" and "1" messages form binary code to represent specific data. For the rewritable CD-RW, the smear is not organic dye, but a kind of carbon material, when the laser is not in the burning, burning a "pit", but change the polarity of the carbon material, by changing the polarity of carbon material, to form the "0" and "1" code sequence. The polar carbon material can be repeated change, this means that the CD can be repeatedly erased.
The disc is made of resin material, not magnetic material, without magnetism
