Asus P1-AH1 - Manual (Page 86)

5-26 Chapter 5: BIOS setup
1st ~ xxth Boot Device [Removable]
These items allow you to select your boot device priority.
Configuration options: [Removable] [Hard Disk] [CDROM] [Legacy LAN]
[Disabled]
5.6 Boot menu
The Boot menu items allow you to change the system boot options. Select
an item then press Enter to display the sub-menu.
Boot Device Priority
Removable Drives
Hard Disk Drives
CDROM Drives
Boot Settings Configuration
Security
Select Menu
Item Specific Help
Select Boot Device
Priority
5.6.1 Boot device priority
Select Menu
Item Specific Help
Select your Boot
Device Priority
1st Boot Device [Removable]
2nd Boot Device [Hard Disk]
3rd Boot Device [CDROM]
4th Boot Device [Disabled]
Boot Device Priority