Does VCD disk use magnetic material and how to record 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" information form the binary code, which indicates the specific data.
Here, in particular, 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, through the polarity change the carbon material, to form the "0" and "1" code sequence. The polarity of this carbon material can be changed repeatedly, this means that the CD can be repeatedly erased.
