Definitions for optical storage devices
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U.S. National Library of Medicine
Optical Storage Devices
A computer disk read by a laser beam, containing data prerecorded by a vendor. The buyer cannot enter or modify data in any way but the advantages lie in the speed of accessibility, relative immunity to damage, and relatively low cost of purchase.
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"optical storage devices." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/optical storage devices>.