Select Boot Array - ASROCK 775DUAL-880PRO Manual To Installation And Configuration

2.3.4 Select Boot Array

User can select a disk array as boot device if user wants to boot
operating system from an array. Boot disk array may not be
selected if user does not boot the Operating System from the disk
array. Use the arrow key to highlight the "Select Boot Disk" item
then press <Enter>. The channel column will be activated. Just
use arrow key to highlight the target disk array then press
<Enter>. If user select a disk array that has a boot mark and
press <Enter>, then its boot setting will be canceled.