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Secondary storage in popular usage differs from primary storage in that it is not directly
accessible by the CPU. The computer usually uses its input/output channels to access secondary
storage and transfers the desired data using intermediate area in primary storage. Secondary
storage does not lose the data when the device is powered down—it is non-volatile. Per unit, it is
typically also an order of magnitude less expensive than primary storage. Consequently, modern
computer systems typically have an order of magnitude more secondary storage than primary
storage and data is kept for a longer time there. In modern computers, hard disks are usually used
as secondary storage. The time taken to access a given byte of information stored on a hard disk
is typically a few thousandths of a second, or milliseconds. By contrast, the time taken to access a
given byte of information stored in random access memory is measured in billionths of a second,
or nanoseconds
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