secondary storage
<storage> Any non-volatile storage medium that is not directly accessible
to the processor. Memory directly accessible to the processor includes main
memory, cache and the CPU registers. Secondary storage includes hard drives,
magnetic tape, CD-ROM, DVD drives, floppy disks, punch cards and paper tape.
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.
Programs and data stored in secondary storage must first be loaded into main
memory before the processor can use them.
(1997-11-05)
Nearby terms:
secondary cache « secondary damage « secondary key «
secondary storage » second generation computer »
second generation language » second level cache
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