In order to use a hard drive plugged into a hard drive controller card as your operating system, you need to install the operating system onto the hard drive while it is plugged into the expansion card. To do this, complete the following:
Note: Not all hard drive controller cards have drivers that allow you to install the operating system onto the hard drive. All of the hard drive controllers that display this FAQ include this capability.
Before you begin, consult the documentation that came with the motherboard to make sure that the motherboard or BIOS supports booting from an expansion card.