ASUS 970 PRO GAMING/AURA User Manual

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Chapter 2: BIOS Information
2.8 
Boot menu
The Boot menu items allow you to change the system boot options. Scroll down on the menu 
to display more items.
Fast Boot [Enabled]
[Disabled] 
Allows your system to go back to its normal boot speed.
[Enabled] 
Allows your system to accelerate the boot speed.
The following items appear only when you set the 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.