optical disc

 optical disk is a form of removable storage it include CDS DVDs and Blu-ray discs. optical  drive use our lives to read and write data on optical disk the leather stand for light amplification through stimulated emission of radiation laser beam right on the surface by creating small PIT in the discs. optical discs store data in a single track that spirit from the centre of the disk to the edge of the disc. most test of and laptop computer have at least one optical drive optical drive read data by focusing laser beam on the surface of the disc or less that detect the presence of a fit the presence of fit indicates 1 an absence of pit indicate viro converts the fits into digital data optical disk storage capacity for from 700mb  several GB.

 categories of optical disk CD and DVD

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