Asus RAMPAGE IV BLACK EDITION - Manual (Page 128)

3-38 Chapter 3: BIOS setup
Chapter 3
3.8 Boot menu
The Boot menu items allow you to change the system boot options.
Scroll down to display the other BIOS items.
Fast Boot [Disabled]
[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].
SATA Support [All Devices]
[All Devices] All devices connected to SATA ports will be available duting
POST.
[Hard Drive Only] Only hard drives connected to SATA ports will be detected
during POST.
[Boot Drive Only] Only boot drive connected to SATA ports will be detected during
POST.