What are these Files of pagefile.sys & hiberfil.sys & System Volume Information Folder

What are these files in my machine?  I am running low in my hard drive and I want to delete them.  I do not need any windows restore point.  I have no idea what are these files and whether or not it is risky to delete them.  the sizes of these files are huge and I want to get rid of them.
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Skylar-BarlowAsked:
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JohnBusiness Consultant (Owner)Commented:
You can reduce your page file in System Properties although System Managed is normally best.

You can disable Hibernation in Power Management Properties and that will delete hiberfil.sys.

You can run Disk Cleanup and click on Clean up System files. Let this run. It will take a while.

Do NOT delete items manually in System Volume Information.

What you are targeting is normal Windows stuff. Also delete documents you do not need from My Documents.

Finally, as always, get a bigger disk drive.
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Skylar-BarlowAuthor Commented:
Thanks John.  What is the main function of windows Hibernation in power management?  What does it do and if i disable it what do i lose ?
Can you please help me understand how can i reduce my page file and where is my system properties?
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JohnBusiness Consultant (Owner)Commented:
Hibernation writes memory to disk and does not turn the machine all the way off. This leads to faster startup when you in-hibernate.

Page File is in Advanced System Properties

Windows-10-Page-File-settings
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Skylar-BarlowAuthor Commented:
Thanks John. where do I go for the power management setting. I put in search box Hibernation and nothing returned.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The pagefile is virtual memory.  It's used to keep physical RAM free enough to allow the system to run responsively.  With a  6 GB pagefile your computer probably doesn't have a lot of physical RAM - 4-8 GB I would suspect.  4 GB is ok, but not great.  8 GB is good but not great.  The more RAM you have (to a point) the faster your computer will operate).  You can adjust the size of this file, but 6 GB is typically quite good.  If this is a desktop, then you could relocate it (properly, not by dragging and dropping) to another physical disk or partition, but otherwise, I wouldn't touch this.

The hiberfil file stores your RAM when you "hibernate" the computer.  Hibernate is like turning it off, but saving exactly where you are so you can resume it later.  This is DIFFERENT from sleep.  Sleep is still using power to maintain RAM (as opposed to storing it in Hiberfil).  Your computer can only Sleep as long as it has power and it will drain the batter.  Hibernate, when done, doesn't require power.  You can hibernate, unplug the computer, pull the battery, and then put everything back and a month later, resume right where you left off.  You can disable hibernation but if you do, only sleep will be available.

Unless you're looking to cause problems for your computer, DO NOT manually delete anything out of System Volume Information.  Windows expects things to be there.  Follow the advice of using disk cleanup to reclaim what space windows can allow you to reclaim.
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JohnBusiness Consultant (Owner)Commented:
Power Options can be found in Control Panel or off the power icon in the system tray.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Hibernation writes memory to disk and does not turn the machine all the way off. This leads to faster startup when you in-hibernate.
This is wrong.  Hibernate DOES turn the machine off.  Try it.
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JohnBusiness Consultant (Owner)Commented:
What I meant to say is that it starts from what was written to hiberfil.sys and is faster

Sorry for the confusion.
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JohnBusiness Consultant (Owner)Commented:
Here are the Power Management Settings.

Windows-10-Power-Management
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Skylar-BarlowAuthor Commented:
Thanks so much Lee.  very well explained. much appreciated!
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Skylar-BarlowAuthor Commented:
Many Thanks John.
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Skylar-BarlowAuthor Commented:
This is weird, I cannot close this question by selecting best solution and assisted solution. seems like they removed this option replaced it with helpful marking.
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Skylar-BarlowAuthor Commented:
John,

I can see that your setting Hibernate after setting shows "Never for both plugged and on battery,

mine looks like this below image.  how can i turn that to "never" just like yours?

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JohnBusiness Consultant (Owner)Commented:
Click on the Blue text and go down (or possibly up) to Never.

I set Hibernation to Never and Sleep on AC Power to Never as well.

I have an SSD drive so I set Sleep on Battery to 5 Hours.
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Skylar-BarlowAuthor Commented:
Thanks John.  found it.
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Skylar-BarlowAuthor Commented:
Thanks everyone.
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JohnBusiness Consultant (Owner)Commented:
Thanks for following up and I was happy to help you.
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Skylar-BarlowAuthor Commented:
Thanks John for your help as usual.
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David Johnson, CD, MVPOwnerCommented:
from an elevated cmd prompt
To disable hibernation in power options
powercfg.exe /hibernate off,

Open in new window


To enable hibernation in power options
powercfg.exe /hibernate on,

Open in new window

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Skylar-BarlowAuthor Commented:
Many thanks David
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