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Most computer [[operating system]]s use the concept of [[virtual memory]], allowing the utilization of more primary storage capacity than is physically available in the system. As the primary memory fills up, the system moves the least-used chunks ([[Page (computer memory)|pages]]) to a swap file or page file on secondary storage, retrieving them later when needed. If a lot of pages are moved to slower secondary storage, the system performance is degraded.
The secondary storage, including [[Hard disk drive|HDD]], [[
=== Tertiary storage ===
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