The 'pagefile' (pagefile.sys) is an area of the hard disk that's used by Windows as 'virtual memory' when all the available RAM (the 'real' memory) is full of data , leaving no RAM free for whatever Windows (and Windows applications) needs to do at any particular time. The size of pagefile.sys is set by Windows (unless you over-ride it) according to how much RAM that PC has -- That data might have to be shifted or 'swapped' temporarily into virtual memory, hence a larger pagefile.sys file is required to at least match the amount of physical RAM. In reality, if Windows is allowed to manage the size of this file, it may decide that a smaller size is sufficient unless it finds that size is regularly not enough, in which case it can increase it automatically. But in principal, more RAM means a larger paging file.
As for the differences in the amount of installed data on the two system drives, that can be affected by how many applications are installed (and how 'big' those applications are. You see, when you install an application a large number of support files are added to the Windows folders, even if you choose a different drive or partition for installing that application. Several files just have to go into the Windows folders on the system drive, that's unavoidable no matter where the parent program is installed. In any case, the differences in pagefile size between the two computers accounts for most of it.
Edited by pip22, 27 February 2008 - 04:50 AM.