CD-ROM, compact disc read-only memory - a compact disk that is used with a computer (rather than with an audio system); a large amount of digital information can be stored and accessed but it cannot be altered by the user

EPROM, erasable programmable read-only memory - (computer science) a read-only memory chip that can be erased by ultraviolet light and programmed again with new data

computer memory, computer storage, memory board, store, memory, storage - an electronic memory device; "a memory and the CPU form the central part of a computer to which peripherals are attached"

computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures