What is the role of the hibernate file hiberfil. sys? How can I clear it?

What is the role of the hibernate file hiberfil. sys? How can I clear it? Is the system disk space insufficient recently? How can I simply delete the system Sleep file?

Recently, I was reminded by Windows that "the system disk space is insufficient", and the software to be detached is almost unmounted, so I still cannot spare much space. At this point, several more applications become stuck during work, not to mention installing other software ?!

Finally, the system Sleep file "hiberfil. sys" was used ". This fat and strong guy swallowed up as much space as 1.5 GB of system disk (BTW: GB of system memory ), the key is that there is no sleep or sleep option at the root of the Shutdown option of my W2K8 system. A useless thing occupies so much space for me, this makes it even harder to get rid of it !!!

After some hard work, I finally got it done through the following ultimate command. The effect was immediate. The system disk made up GB of available space at a moment. It was so nice!

Powercfg-h offBTW: this command is also useful in Vista or Win7 ~