Nvidia NFORCE 650I - Manual (Page 45)

Mainboard nForce 650i Ultra
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2. Then you will see an alert box to notify you that you selected an invalid number of disks. In
a mirrored array, you can only configure two disks at one time. You must press <Enter> to
go back to the main screen to reconfigure your options again.
＊ The RAID Introduction to this manual explains disk requirements for each RAID
configuration.