Asus P5MT-C - Manual (Page 129)

ASUS P5MT-C 5-35
5.3.7 Selecting the boot drive from a RAID set
You must have created a new RAID configuration before you can select the
boot drive from a RAID set. Refer to the Creating a RAID set: Using New
Configuration section for details.
To select the boot drive from a RAID set:
1. From the Management Menu, select Configure > Select Boot Drive,
then press <Enter>.
2. When prompted, press the <SpaceBar> to select the bootable logical
drive from the list, then press <Enter>.
3. The logical drive is selected as boot drive. Press any key to continue.