By default, your laptop is set to allow hibernation, a state of deep sleep where the contents of your RAM are saved to the hard drive rather than using power in the memory chips themselves.

Unfortunately, for hibernate to work, the system has to keep a large system file called hiberfil.sys that eats up several gigabytes, even when the computer is powered on. If you’re willing to live without hibernation mode, you can save the space.

Open the Command prompt as administrator. Just type cmd into the search box, right-clicking the result and selecting “Run as administrator.”

2. Type powercfg /hibernate off at the prompt and hit Enter.