This term is part of our Unit 16: Memory and Storage vocabulary list. Please note that pronunciations can vary slightly even in the same dialect.
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UK
a data storage technique using a pattern of markings on a disc that can be read by a laser; examples include CD-ROM, and DVD-ROM technology
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"Optical storage is a good choice for distributing software packages because it has a good mix of storage size, portability, and a low cost to manufacture."