Nvidia NFORCE 650I - Manual (Page 34)

Mainboard nForce 650i Ultra
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Before you create a RAID Array
Before you configure your RAID Array, you have to enable the “RAID” option in the BIOS
Setup Utility.
Integrated Peripherals >> RAID Config >> RAID Enable >> Save & Exit Setup
1. When the screen below displays, press <Delete> to enter the BIOS setup screen.
2. Move the arrow keys to the "Integrated Peripherals" item and press <Enter> .