Optical Disc use For Storing Data..
CD was introduced in early 80′s. It was the great revolution after the reel cassettes. People really wanted to get rid of reel cassettes because they were very sensitive. They were even got damage but the rays of sun light. So people used to loose all their import data. That’s why this optical disc was made. Today it has many names like vcd, dvd, blu ray etc but it short it is a disc. It has different storage even more than 20GB. You can write or burn your data on it through optical rays in your computer. CD is basically of two types, writable and re-writable. In case of writable, you can write data on CD only for one time. It can’t be removed/erased. But in case of re-writable CD, you can remove and write as many time as you like. One of my friend came to me with the problem that how do i erase a cd. I told him that you can’t erase a cd but data in it. I gave him a very famous software Nero. Now, he always uses it for erasing and re-writing data on CD.