hiberfil.sys What is it?
To avoid some of the drawbacks of Vista's Sleep power-saving mode, you can hibernate your PC. hiberfil.sys saves a copy of everything in your PC's memory (RAM) onto yourhard disk before it shuts down.
Windows uses the file hiberfil.sys, stored in the root folder of your hard disk, to hold your hibernation data. Because it must hold everything in memory, its size is the same as the amount of installed system memory. Have 2 GB of RAM? You'll see a 2 GB hiberfil.sys file on your hard disk that Windows won't let you delete.
How to delete hiberfil.sys
Windows creates the hiberfil.sys file automatically when you turn on the Hibernate feature; the only way to delete the file is to turn off Hibernate.
To do this, open a Command Prompt window in administrator mode and type this
command at the prompt:
powercfg /hibernate off
Then press Enter. If the command returns you to the prompt with no message, the change was successful, and hiberfil.sys should be gone.
If hiberfil.sys is still there, hibernation may've already been turned off, and the file may be left over from an older version of Windows. Another way to delete the file is to use the Disk Cleanup tool (cleanmgr.exe); just select the drive containing the file, place a checkmark next to Hibernation File Cleaner in the Files to delete list, and click OK.
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