Most of Windows users use the hibernation feature to quickly boot into Windows and resume their work. However, hibernation feature is turned on by default on most Windows 10 PCs and but it doesn’t show up in power menu or power button by default. On Windows 10, it can be added to the Start menu power button by referring to our how to enable hibernate in Windows 10 guide.
When you enable the hibernate feature, Windows creates a new file named hiberfil.sys in the root of your system drive (the drive where Windows is installed) to save the system state.
Now, if you have a hiberfil.sys file with a huge size, you might want to reduce its size to free-up some disk space. The default size of hiberfil.sys varies depending on the amount of RAM installed on your PC.
In recent versions of Windows 10, Microsoft has made huge changes to the hibernation file size. The hibernation file size is approximately 40% of the RAM installed on the computer in recent versions. In previous Windows versions, it was up to 95% of the random access memory (RAM) installed on the PC. On my ThinkPad laptop which has 16 GB of RAM, the hibernation file size is just 6.34 GB.
One can reduce the hiberfil.sys file size by executing a simple command in the elevated Command Prompt. But we recommend you keep at least 70% of the original size of the hiberfil.sys.
How to reduce the size of hiberfil.sys file in Windows 10/7/8
IMPORTANT: It’s worth noting that Windows 10 doesn’t allow you to shrink the size of the hiberfil.sys file if the file size is 40% or lesser the size of the installed RAM.
Step 1: Open elevated Command Prompt by typing CMD in Start menu search filed, right-click on Command Prompt entry, and then click Run as administrator.
Step 2: In the command prompt, type the following command and hit enter.
Powercfg –h –size percentsize
In the above command, replace percentsize with your value (for example, 60%), but it cannot be smaller than 50.
Step 3: Exit the Command Prompt and you are done!