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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), )
secondary storage
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storage Any non-volatile storage medium that is not
directly accessible to the processor. Memory directly
accessible to the processor includes main memory, cache
Secondary storage devices are usually accessed via some kind
of controller. This contains registers that can be directly
accessed by the CPU like main memory ("memory mapped").
Reading and writing these registers can cause the device to
perform actions like reading a block of data off a disk or
rewinding a tape. See also DMA.