Windows Virtual Memory
Does your C drive seem to have shipped with less space than the actual hard drive specification? It must be baffling after finding the file size of all files and folders and yet C: simply shows to occupy much more space than its actual contents.
The answer is due to the virtual memory. Virtual memory plays an important role in memory management. All idle processes are stored in virtual memory so that the physical memory (your RAM) has more space to run the current processes or accept new ones.
To view the size of your pagefile.sys and find out why c: seems to occupy more space than your files and folders, follow these instructions.
1. Go to 'Start' -> 'Control Panel'
2. Open the 'Folder Options' icon
3. Choose 'View' tab
4. Uncheck 'Hide protected operating system files' and choose 'Yes' when prompted for confirmation
5. Choose 'Show hidden files and folders'
6. Open C:
7. You should see a pagefile.sys that would occupy a lot of space. It is the virtual memory on the hard drive. Caution: Do not delete or modify it.
8. Now, select all the contents of the c drive(ctrl+a), right-click and choose 'properties'
9. You will find the exact space occupied by the C drive
To view more information about your computer,
Select Start -> Run, type in msinfo32 and hit enter.
You will find the details regarding the processor family, page file, virtual memory and other information