When you shutdown a PC with Fast Startup turned on, Windows saves the current system state and the contents of memory to a file called hiberfil.sys and then it shuts down the computer. This article will explain how the Fast Startup works and walk you through the steps to turn on / off Fast Startup missing in Windows 10. How to enable / disable fast startup in Windows 10? The “Turn on fast startup (recommended)” option is missing from the Power Options? Fast Startup is a new feature of Windows 10/8, that allows a computer to boot faster than before.
