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Word Count: 495
As we all know cd-rom and cd disk is widely used in almost every area of human society to record valuable data or information we can come across many kind of CD-ROM such as CD CD-R CD-RW VCD DVD ect What is the difference and how they differ between these sort of CD-ROM is the topic we are going to discuss CD CD-R CD-RW DVD VCD THE invention of CD is a great revolution of data record and storage it can content far more than a floppy disc and it is much smaller than a hard driver even though the hard driver has larger capacitance so people can carry the data or information they need much easier But in the early days CD-disc is not recordable it means user just can read the information from disk by using some equipment only What if they wish to write some information into a CD-DISK CD-R is the answer of this question The surface of a CD disc is a piece of chemical dope many pits are distributed on it which is used to change the laser refractive index of the surface and these pits are physically what data like on a disc in another word these pits are the information or data we need The surface of a CD-R disc is smooth there are no pit on it CD-R diver use different sort of laser which has different wave length to burn pits onto the surface then data was stored on a cd-r disc CD-RW is the improvement of CD-R the surface is made by some different material so that it can be burn several times then data can be created and remove many times just as a hard driver is DVDVCD is the product basic on CD theory The difference is the data capacitance The
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