The area of the hard disk that stores the RAM
image is called a page
file. It holds pages of
RAM on the hard disk, and the operating system moves data back and forth
between the page file and RAM. On a Windows machine, page files have a .SWP
extension.
Pagefile.sys is a windows system files, acts as
swap file and was designed to improve performance. Windows uses it as RAM in
case the application you're running on your computer ends up needing more RAM
than you actually have. Usually page file is 1.5 times than your actual
physical memory size, it is the recommended minimum size. The maximum size is 3
times than your actual physical memory size. Pagefile.sys is a hidden file.
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