If you did check your computer for huge files that wasted lots of disk space you might have come upon a file called hiberfil.sys sitting in your C: drive with a size anywhere between 512 Megabytes and 4 Gigabytes depending on the RAM in your computer. If you choose to go into Hibernation mode in Windows the operating system will save everything stored in RAM to your hard drive which results in this huge file hiberfil.sys

