An optical storage device is a laser used on a spinning disk to store data. In order to do so, marks are made in patterns so that they are readable with light. An old example of an optical storage device is known as a microform. Microforms are small pieces of film or paper in which documents are stored and can be read. When using a microform, a document is reduced to about 25 times it's original size. Today there are other means of optical storage devices which are currently in the making.
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