auxiliary storage

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Noun1.auxiliary storage - a data storage device that is not the main memory of a computerauxiliary storage - a data storage device that is not the main memory of a computer
memory device, storage device - a device that preserves information for retrieval
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References in periodicals archive ?
1Gb of backing storage would hold 400,000 A4 pages of text.
In the systems software group, the operating system consists of a number of programmes that control the operation of the central processing unit: the input, output and backing storage devices.