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Windows 7: Hiberfil.sys size

08 May 2010   #1

Windows 7 Professional x64
 
 
Hiberfil.sys size

I understand that the Hiberfil.sys file used for hibernation is normally the same size as the amount of intalled memory in the PC. On my Win 7 Pro x64 PC the OS reports 4GB Memory with 3.84GB usuable. The hiberfil.sys though is 3090,718,720 bytes which I reckon to be 2.88GB approx. As I have been having some resume problems from hibernation I was wondering if this smaller file size could have anything to do with it.

I have used powercfg -h off to delete the file and then powercfg -h on but the file size is still the same.

Any suggestions?

My System SpecsSystem Spec
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08 May 2010   #2

64-bit Windows 8.1 Pro
 
 

The default setting for Hiberfil.sys is 75% of your RAM ... you can change it by opening a command prompt with admin privilages, then enter..

Code:
PowerCfg.exe /HIBERNATE /SIZE percentage
My System SpecsSystem Spec
08 May 2010   #3

Windows 7 Professional x64
 
 

Good answer Tews....glad to see you are still helping people here. Just wanted to say hello. I hope you are well...
My System SpecsSystem Spec
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08 May 2010   #4

Windows 7 Professional x64
 
 

Thanks for the info.

Just curious how the system can write the contents of memery to a file of smaller size than the memory in the PC?
My System SpecsSystem Spec
08 May 2010   #5

64-bit Windows 8.1 Pro
 
 

Guess its just one of those mysteries of life...
My System SpecsSystem Spec
08 May 2010   #6

Windows 7 - Vista
 
 

Windows 7 compresses the contents of memory before writing to hiberfil.sys; hence the 75% figure.

From Microsoft Download Center -

"Reducing the Disk Footprint for Windows 7 Hibernation" -->

http://download.microsoft.com/downlo...Footprint.docx

Regards. . .

jcgriff2

.
My System SpecsSystem Spec
08 May 2010   #7

Windows 7 Professional x64
 
 

Thanks for the help, I guess that satisfies my curiousty.
Regards
My System SpecsSystem Spec
15 May 2010   #8

Winndows 7 Home Premium 64
 
 

Does anyone know if hiberfil.sys (and pagefile.sys) are included in a "system image" backup (in win home premium)? Judging by the size of the backup image it seems to me that they are, but I hope someone can tell me that they are not. I guess one could eliminate them before generating a system image but that would be messy. I don't see the point of including these in the "system image".
My System SpecsSystem Spec
15 May 2010   #9
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

Hello Peter, and welcome to Seven Forums.

A system image will include everything that was on the selected HDDs at the time it was created.
My System SpecsSystem Spec
05 Jul 2010   #10

Windows 7 64 bit
 
 

I set my Hibernate to "never", and I still have a 4.5 gb hiberfil.sys file. I can just delete that, right? I'm trying to minimize my disk image size and currently have 10 gb worth of Pagefile and Hiberfil. I figure I can delete the hiberfil, and move the Pagefile to my second drive (as I read in another thread here). I have 6 gb ram, and a 6.5 gb Pagefile... no wonder my 1st Windows 7 image was 35 gb (only 16 gb using Macrium since it compressed it), but why back up stuff you don't need?
My System SpecsSystem Spec
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 Hiberfil.sys size





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