VVirtual memory is a native part of the Windows operating system, functioning aextra RAM memory to balance out the available RAM. Due to the increasing default amount of RAM in new computers, virtual memory can also be a waste of hard-drive space and reading-pin movements, so many users are choosing to get rid of it
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Tips & Warnings
It is generally not a good idea to completely remove the pagefile regardless of the amount of RAM a computer has installed. Change the virtual memory to at least 2 to 50 megabytes, depending on the amount of available space, to function as back-up memory in case the RAM becomes full.
1). The mysterious hiberfil.sys It happens to most users of Windows XP. One day you are searching for a file or cleaning up the PC's hard drive and you encounter a huge file - hiberfil.sys.
Normally located at C:\hiberfil.sys, its size can vary from 250MB to over 2GB. You try to delete the file - it's not a good idea to delete files you don't understand - but Windows won't oblige anyway. That's why you are here.
Windows XP has a feature that is not very well documented and it will be totally new to users of older systems such as Windows 95 or 98. This feature introduced to most users for the first time in XP is called Windows hibernation. Instead of shutting down and restarting your computer, Windows takes a snapshot of everything running on your system, copies it to the hard drive and then turns off most of your hardware. To wake up from hibernation you normally move the mouse or hit the spacebar on the keyboard.
In theory, it is supposed to be a quick shortcut or power saving option that allows you to leave your PC in suspended animation until you are ready to work again. However, in practice, most people find little time difference between shutting down and using hibernation. For people who use drive imaging to backup their system, the hiberfil.sys file can bloat the backup files - making them larger (sometimes over 1GB bigger) and therefore slower to copy/restore.
Hibernation temporarily 'freezes' the computer when the PC becomes inactive, so it won't work if you have tasks running constantly (eg downloading files). However it can be handy if you want the computer to sleep after a task has completed (such as creating a video).
OK, that's the role of hibernation - so what is the hiberfil.sys file and why is it so big? Hibernation takes everything in memory and writes it to your hard drive as the hiberfil.sys file. If you have 512MB of memory, then hiberfil.sys will be about 512MB. If you have 2GB, the file will be around 2GB. The important point to remember is that even if you don't use hibernation, hiberfil.sys will still take up this huge amount of disk space. The way to remove the file is to turn off the hibernation feature (by default, hibernate is activated automatically when XP is installed). Here's how to do it:
Open the Windows Control Panel
Double-click Power Options
Click the Hibernate tab, de-select the 'Enable hibernate support' check box, and then click Apply.
Restart your computer and hiberfil.sys should be automatically deleted (this is not always the case - simply delete it if Windows didn't do it for you).
If you change your mind in the future and would like to use hibernation, go back to the Hibernate tab as described in the first three steps and check the box 'enable hibernation'.
2).
In Windows operating system environment such as Windows XP and Windows Vista system, there is always a file named hiberfil.sys created and existed in the system root drive on boot disk. The hiberfil.sys is large and big in size, always as big as your system physical memory (RAM) size. For example, if the computer have 2 GB of DRAM memory, the hiberfil.sys file size will also be around 1.99 GB in size, taking up precioushard disk space, and in worse case increase fragmentation on the drive.
hiberfil.sys is a file that Windows system creates whenever the computer goes into hibernation mode. When system hibernates, the system state of the computer is preserved by storing a copy of all data in the memory in hiberfil.sys file located on your local disk, so that when the computer restarts, the information can be read into memory to restore the state as of exact state when computer starts to hibernate. That also explains why the size of hiberfil.sys file is always same size with computer’s memory size.
If you have ever used hibernation feature in XP and Vista, the hiberfil.sys file will be created. Actually, Windows kernel reserves hiberfil.sys file and allocates space equivalent to memory size to it when installing Windows and enables hibernate ability by default, thus the file exists too even if you never put system into hibernation mode. However, when the computer wakes up from hibernation, the hiberfil.sys file is left on the hard disk and not deleted. If you no longer use the hibernate feature of Windows XP and Vista, the safest way to remove and delete hiberfil.sys from the hard disk is to turn off and disable hibernation function.
How to Disable Hibernation in Windows XP
Go to Control Panel, click on Performance and Maintenance link, then run Power Optionsapplet.
Go to Hibernate tab.
Uncheck and untick the Enable hibernation option.
The hiberfil.sys file should have been removed and gone, if not you can safely delete it.
3).
You’re no doubt reading this article because there’s a gigantic hiberfil.sys file sitting in the root of your drive, and you want to get rid of it to free up some space… but you can’t!
Luckily, you actually can delete it, and today we’ll show you how.
The more memory you have in your PC, the bigger the file will be.
So What is hiberfil.sys Anyway?
Windows has two power management modes that you can choose from: one is Sleep Mode, which keeps the PC running in a low power state so you can almost instantly get back to what you were working on. The other is Hibernate mode, which completely writes the memory out to the hard drive, and then powers the PC down entirely, so you can even take the battery out, put it back in, start back up, and be right back where you were.
Hibernate mode uses the hiberfil.sys file to store the the current state (memory) of the PC, and since it’s managed by Windows, you can’t delete the file.
So if you never use it, and want to disable Hibernate mode, keep reading. Personally I stick with Sleep Mode the vast majority of the time, but I do use Hibernate quite often.
Disable Hibernate (and Delete hiberfil.sys) in Windows 7 or Vista
You’ll need to open an administrator mode command prompt by right-clicking on the command prompt in the start menu, and then choosing Run as Administrator. Once you’re there, type in the following command:
powercfg -h off
You should immediately notice that the Hibernate option is gone from the Shut down menu.
You’ll also notice that the file is magically gone!
For more about dealing with Hibernate like setting how long it takes to head into Hibernate mode, you can check out our article on How to Manage Hibernate Mode in Windows 7.
Disabling Hibernate Mode in Windows XP
It’s a lot easier in Windows XP to get rid of Hibernate mode… in fact, we’ve already covered it before, but we’ll cover it again. Just head into Control Panel –> Power Options, and then find the Hibernate tab.
Uncheck the box, reboot your PC, and then you can delete the hiberfil.sys file.
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