Asus P5W - Manual (Page 175)

ASUS P5W 5-5
6. Install the operating system.
7. Install the ASUS EZ-Backup Manager utility from the support CD that came
with the motherboard package.
Changing RAID modes
To change from one RAID mode to another, follow steps 1, 4, and 5 of the previous
section, “Creating a Big/Fast RAID set for the first time.”
RAID mode change will destroy any data on the hard disk drives. Backup
existing data before changing RAID modes.
4. Enter the BIOS setup during POST. Go to Advanced menu > DH Feature
page. Set the EZ Backup RAID Mode Change item to Enabled.
Make sure you have made the above BIOS setting.If you changed the jumper
settings but did not enable the EZ Backup RAID Mode Change, the system
applies the default RAID mode, which is RAID 1.
5. Press to save and exit. The system will restart.
The following message appears after you exit the BIOS utility.
EZ Backup RAID Mode will change.
Press F1 to continue.