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demand paging Last modified: Tuesday, October 30, 2001
In virtual memory systems, demand paging is a type of swapping in which pages of data are not copied from disk to RAM until they are needed. In contrast, some virtual memory systems use anticipatory paging, in which the operating system attempts to anticipate which data will be needed next and copies it to RAM before it is actually required.
	Related Categories Virtual Memory Related Terms paging RAM swap virtual memory