Paging is a scheme for the management of memory by which a
computer can store and retrieve data from the secondary storage for the use of
main memory. It is a technique that help us to available the data as quickly as
possible. In this scheme OS copies certain number of pages into main memory,
when a program requires any page then it quickly retrieve from it. If it does
not found a page then invalid page fault occurs, then it copies a page from
hard drive and copy a backup of page into main memory.
Segmentation is the division of computer’s primary memory
into segments or sections. To find reference to a memory location includes a
value two things i.e. value that identifies segment and offset. It is also one
of the way of implementing memory protection. Segmentation is a logical unit,
visible to the user’s program and is of arbitrary size and paging is a physical
unit visible to the user’s program and is of fixed size.
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