Disable Hibernation – When you hibernate your system, it saves the contents of its RAM to your hard drive. This allows it to save its system state without any power usage – the next time you boot your computer, you’ll be back where you left of. Windows saves the contents of your RAM in the C:\hiberfil.sys file. To save hard drive space, you can disable hibernate entirely, which removes the file.


Disable System Restore – If reducing the amount of space System Restore uses isn’t good enough for you, you can disable System Restore entirely. You’ll be out-of-luck if you need to use System Restore to restore your system to an earlier state, so be warned.