<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. Try this search on Wikipedia, OneLook,
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