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[[Image:Page dir.png|frame|A Page Directory Entry]]
The page table address field represents the physical address of the page table that manages the four megabytes at that point. Please note that it is very important that this address be 4 KiB aligned. This is needed, due to the fact that the last bits of the
* S, or 'Page '''S'''ize' stores the page size for that specific entry. If the bit is set, then pages are 4 MiB in size. Otherwise, they are 4 KiB. Please note that for 4 MiB pages PSE have to be enabled.
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