Asus B85-PLUS - Fast Boot Options; USB Support During Boot

ASUS B85-PLUS
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2.8 Boot menu
The Boot menu items allow you to change the system boot options.
Scroll down to display the following items:
2.8.1 Fast Boot [Enabled]
[Enabled] Select to accelerate the boot speed.
[Disabled] Select to go back to normal boot.
The following four items appear when you set Fast Boot to [Enabled].
USB Support [Partial Initialization]
[Disabled] All USB devices will not be available until OS boot up for a
fastest POST time.
[Full Initialization] All USB devices will be available during POST. This process will
extend the POST time.
[Partial Initialization] For a faster POST time, only the USB ports with keyboard and
mouse connections will be detected.