Some of you may learn from this or find it useful.
When I bought this computer I only allocated 40 GB to my system drive. Big mistake, and I've had to juggle system files a lot, but I've gotten by with it... Until today.
This week, I decided to upgrade - One upgrade was to double the size of my RAM. When booting it up after, I immediately found that my system volume was suddenly full. Disk cleanup only freed a gig, and the file sizes on the drive only added up to half the size of the volume according to windows explorer... There was something that explorer wasn't telling me.
After doing some research and downloading
TreeSize, it revealed two files I didn't know about
: pagefile.sys and hiberfil.sys, both of which were the size of my new amount of RAM. Pagefile is self explanatory, Hiberfil.sys is where the system temporarily stores memory during hibernation - Useless if you never hibernate your PC.
Instructions on how to disable the hibernate function can be found here if you need more space on your system volume.
Yay, computing.