Hiberfil.sys file is a system file that is used by Windows to support Hibernation. If you have enabled Hibernation in Windows, you will see this file. When you have Hibernation, and subsequently ...

Huge files in the system folder: Hibernation & Co. The operating system creates two swap files Windows with crash log and hard disk test Huge folders and what’s behind them Mysterious processes ...

Hiberfil.sys can use several GB of hard disk space. Delete the file, and it will likely return. Bill Detwiler explains how to get rid of it for good.