Disable Hibernation Without Disabling Fast Startup

Fast Startup is a feature in Windows 8 and 10 which speeds up the boot process significantly. With Fast Startup enabled by default, when the user shuts down the computer, what happens under the hood is a hybrid shutdown sequence.

When a user issues the shutdown command, all user accounts are logged off completely. Then the system hibernates at this point — writing the OS kernel image and loaded drivers to the hiberfil.sys file, located in the root of your system drive (typically C:).

Powering on the computer again would cause the hiberfile to be loaded, restoring the previously saved image of the Windows kernel and loaded drivers. That’s how Fast Startup works. This way, boot ups are faster when compared to the traditional shutdown & cold startup.

Hiberfile (hiberfil.sys) type can be set to “Full” or “Reduced”. In “Full” mode, which is the default setting, hiberfile size would be 40% of the total physical memory.

Note: In Windows 7, the default size of the hibernation file is equal to 75% of the total physical memory.

reduced or full hiberfile type
Total Physical Memory – 7.9 GB
reduced or full hiberfile type
Full Hiberfile size – 40% of 7.9 GB

Whereas in Reduced mode, hiberfile consumes disk space that equals to only 20% of the RAM.

Reduced mode is sufficient if you need the hiberboot (Fast Startup) feature, but don’t have the necessity to put the device into (full) hibernate mode manually. It helps to set hiberfile to “Reduced” if you’re running short of disk space on the system drive.



Hibernation file typeDefault sizeSupported power states
Full40% of physical memoryfast startup, hybrid sleep, hibernate
Reduced20% of physical memoryfast startup

via MSDN

Set Hiberfile type to Reduced or Full, using Powercfg

Open an elevated Command Prompt window. Type the following command and press ENTER.

powercfg /h /type reduced

reduced or full hiberfile type

reduced or full hiberfile type
“Reduced” Hiberfile size – 20% of 7.9 GB

You won’t be able to put your system to Hibernate mode manually when hiberfile type is set to Reduced — the “Hibernate” command wouldn’t even show up in the Start menu as well as in the Win + X menu.

If you later decide to revert to the default setting, which is Full, use this command:

powercfg /h /type full

Fast Startup feature, which utilizes hiberfil.sys, doesn’t work if you’ve turned off hibernation altogether using the Powercfg.exe /hibernate off command.

About the author

Ramesh Srinivasan founded Winhelponline.com back in 2005. He is passionate about Microsoft technologies and has a vast experience in the ITeS industry — delivering support for Microsoft's consumer products. He has been a Microsoft MVP [2003 to 2012] who contributes to various Windows support forums.

4 thoughts on “Disable Hibernation Without Disabling Fast Startup

  1. Unfortunately, “powercfg /h /type reduced” command didn’t work for me. It returned with “The parameter is incorrect”.
    No problem with “powercfg /h /type full’.

  2. @Mauro: No issues here, using Hibernation multiple times daily. But lately I’ve seen some reports concerning internet connectivity problems when Fast Startup is used (which is ON by default). “Restarting” the system resolves the problem, atleast momentarily.

  3. I disbled hibernation by “Powercfg.exe /hibernate off” command. There is an evidence that hibernation has many drawbacks that can prejudice the operation of windows 10 pro when it wakes up from hibernation. The trade is only a low time delay in starting up my OS and good memory savings in my 32 bit based system. I owe a low end notebook, and I’m very satisfied of its performance, in my everyday chores. I use a 32 bit OS for its better compatibility with utilities I bought since I had XP.

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