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backing storage[′bak·iŋ ‚stȯr·ij]
A computer storage device whose capacity is larger, but whose access time is slower, than that of the computer's main storage or immediate access storage; usually slower than main storage. Also known as bulk storage.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
auxiliary storage(1) Storage outside the computer case. The term may refer to storage that is part of the computer, such as an external hard drive, or to an array of stand-alone drives that are independently controlled. See external storage, disk array, NAS and SAN.
(2) One or more internal storage drives in addition to the primary hard drive or SSD in the computer. See storage.
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