If you’re in need of disabling hibernation on your 2008 servers (or your Vista desktop, as the case may be), open a command line and type this:

powercfg.exe /hibernate off

To turn it back on, replace “off” with “on”.

This will do away with that annoying file (hiberfil.sys) at the root of C:\ (or whatever your system volume’s drive letter may be) that is the size of your physical RAM – thus freeing up much space.

Keep in mind, however, that hibernation cannot be turned on if you have Hyper-V installed.  I’m curious, though, why would you hibernate a server?  And before those of you that use 2008 as a workstation complain, why would hibernation be enabled by default?