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. In a previous TR Dojo Challenge question, I asked ...

How to delete the Windows 10 paging file on every shutdown Your email has been sent Survey after survey tells us that IT professionals and decision-making executives all over the world who work in ...

Windows: If you routinely use Hibernation mode, this trick isn't for you. If you never use Hibernate mode on your desktop or laptop, this trick will free up 4-6GB of disk space on your system disk.

You should have no problem with deleting it by hand, if the OS isn't using it. You'll need to turn off the system and hidden attributes on the file, of course. The OS won't let you delete the file if ...