Since virtual memory is stored on the hard drive, what remains in the virtual memory at shutdown will still be there when you start up your computer at your next session. This means that once power is cut from the computer all data in the memory is lost. When you shutdown Windows 7, the data in your computer’s RAM is lost because PC memory is volatile. There is a lot of debate as to how much memory Windows should set aside for virtual memory but 1.5 times the physical memory in a PC is the general heuristic. The amount of hard drive space set aside for virtual memory ranges from zero to about 1 to 2 times the memory you have installed in your computer. To make more efficient use of information that your computer must keep track of, Windows 7 uses a small portion of your hard drive to simulate more memory and make memory allocation more accessible by applications. The amount of memory you can put into your computer is finite.
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