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Page fault

<memory management> In a paged virtual memory system, an access to a page (block) of memory that is not currently mapped to physical memory.

When a page fault occurs the operating system either fetches the page in from secondary storage (usually disk) if the access was legitimate or otherwise reports the access as illegal.

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PAGE page paged Page Description Language Paged Memory Management Unit	fault General Protection Failure Memory Management Unit page fault prepaging	page in pagelet page mode Page Mode DRAM Page Mode Dynamic Random Access Memory