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superuser.com/a/1165426/19943– Mokubai ♦Commented Dec 3, 2021 at 9:31
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Programs operate in virtual memory, but the virtual memory pages may simply be unallocated when paged out. When a program accesses an unallocated page it causes a page fault which triggers the operating system to read it from the page file to physical RAM and map it back into the virtual address space.– Mokubai ♦Commented Dec 3, 2021 at 9:43
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"We know that virtual memory allow to use some part of disk known as page file (Swap Space) as memory as well." -- The conceptual name for this page file or swap space is backing store. To regard this backing store as an addressable part of a "virtual memory" rather than a storage mechanism is a misunderstanding of how virtual memory works. See superuser.com/questions/748743/…– sawdustCommented Dec 3, 2021 at 10:44
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