hyberfil.sys : Java Glossary
- hyberfil.sys is a whacking huge file on your C: drive used to store a system image when your
computer is hibernating (powered off, but able to restart without rebooting). It is mainly of use
in laptops. If you have your system drive on an SSD (Solid State Disk), you will want to get rid of
hyberfil.sys to free up room
for more important files. You can’t just delete it. However, you can tell Vista/W2008/W7-32/W7-64/W8-32/W8-64 to delete it and stop using it.
powercfg -h off