BCDEdit Reference

The Boot Configuration Data store (BCD) contains boot configuration parameters and controls how the operating system is booted for Windows Vista and later versions. BCD abstracts the underlying firmware and provides a common programming interface that can be used to manipulate the boot environment for all systems running Windows Vista or later versions of Windows. Every such system has a system BCD store that contains the data that controls the boot environment. Systems can have additional BCD stores, but only one store at a time can be designated as the system store.