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The CD-ROM format refers to an optical disc storage technology that contains data accessible only by personal computer. Similar to the computer disk in function, it serves as a medium to convey adapted audio (and video) versions of commercially printed materials or as an auxiliary tool for extra materials not found in the related printed volumes. This format is generally used as an extra feature for academic textbooks, instruction manuals, and educational books. For more information on the CD-ROM format, please visit Wikipedia: http://en.wikipedia.org/wiki/Cd-rom
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