Issue: In windows vista, 7 or 2008, hiberfil.sys takes up large disk space on your Root drive. The more memory you have, the the larger the file gets
Synopsis: Hiberfil.sys is used to store contents of RAM when the computer hibernates. It’s typically the same size as the the total RAM. It’s a hidden system fileResolution: If you don’t need to hibernate your system, you can safely remove the the file by following these steps:　Click Start -> All Programs -> Accessories
Right-click Command Prompt
Select Run as administrator
In this privileged command prompt window, enter: powercfg -h off
Right-click Command Prompt
Select Run as administrator
In this privileged command prompt window, enter: powercfg -h off
Instantly, hiberfil.sys is gone. The space recovery is instant as well
Ex-Shell 