1.    26 Aug 2015 #1
    Join Date : Oct 2014
    Posts : 321
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64

    Did the default Hibernate file size change for Win 10 ?

    In Win 7 the default hibernate file size is 75% of RAM.
    I have 6 GB RAM, dual boot Win7-x64 and Win10-x64.
    6 GB RAM shows as installed in both OS's (it's not a hardware reserved issue).

    Win10 set the hiberfil.sys to 2.39 GB.
    Win7 set the hiberfil.sys to 4.49 GB.

    Is this as expected, or do i have an issue ?
      My System SpecsSystem Spec

  2.    26 Aug 2015 #2
    Join Date : Mar 2015
    Posts : 191
    Windows 10 Pro (x64)

    It is normal. You can adjust the size of the hibernation file in the command prompt.

      Enables/disables the hibernate feature or sets the hiberfile size.
    Parameter List:
      <ON|OFF>                Enables/disables the hibernate feature.
      /SIZE <PERCENT_SIZE>    Specifies the desired hiberfile size as a percentage
                              of the total memory size. The default size cannot be
                              smaller than 40. This parameter will also cause
                              hibernate to be enabled.
      /TYPE <REDUCED|FULL>    Specifies the desired hiberfile type. A reduced
                              hiberfile only supports hiberboot.
      My System SpecsSystem Spec

  3.    26 Aug 2015 #3
    Join Date : Oct 2014
    Posts : 321
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64

    OK, thanks for the help !
      My System SpecsSystem Spec

  4.    26 Aug 2015 #4
    Join Date : Oct 2014
    Posts : 601
    Windows 7

    You can set the size of the hibernation file to less than 75% of RAM size but there are dangers. When going into hibernation the contents of RAM are copied to hibefil.sys and copied back when coming out of hibernation. Compression is used in the process but there is no way of knowing ahead of time how much space it wil save. If the size of hiberfil.sys is too small hibernation will fail.

    I wouldn't go lower than 75% unless disk space is a real problem.
      My System SpecsSystem Spec

  5.    28 Aug 2015 #5
    Join Date : Oct 2014
    Posts : 321
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64

    Thanks for the advice and info. +1

    I just wondered if the default size changed in Win 10, or I had an issue and should start with another clean install of W10.
    I like to fix things sooner rather than later.
    Disk space isn't a problem.
    I've been using Sleep and Hibernate reliably for many years with W7 and W8.x.
    It's just my preference to let my PC's auto (or manual) Sleep/Hibernate rather than power off.

    So far W10 Sleep (Hybrid) works reliably for me.
    I haven't turned off the power while sleeping to make sure hybrid sleep/hibernate resumes reliably (yet).
    I don't know why MS changed the default size and what else might have changed, but i want to play around with this when i have time.

    There should be a warning when a user hibernates a PC and there is not enough space in the hiberfil file to successfully restore the session.
    I know W7 doesn't do that, so i want to test the "new W10 hibernate logic" to see what happens.
    For me, it would be nice if it automatically increased the size as needed (space permitting), but i won't hold my breath on that.
      My System SpecsSystem Spec


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