CD-ROM recording information principle, specific points, why not use magnetic material?
For example, we now computer hard disk is a magnetic material, but the principle is completely different and tape, computer hard disk is a disk, there is a small magnetic unit, the units have no magnetic stands for 1, representing 0. of these small units in the magnetic disk in a circle arranged in neat, each circle is called a track. Our heads read them at high speed and we get information about 1 and 0.
In digital quantities, there are only 1 and 0 two digits. The computer chips read these 1 and 0 and decode them to make up the sounds, images, or other information we need.
To say this, we must first say the principles of modern information recording.There are two kinds of modern information recording, digital record and analogue record.A typical analog storage is the voice information recording tape, magnetic tape is continuous, is equivalent to the waveform to voice the tape, after the head reads magnetic intensity, waveform amplification, output is sound.
