Im not sure about this but i think once the drives show in bios (might need to enable sata but not likely) all the hdd will show when your sata drives are detected you will be given an option to set up your array then,its all simply set out so you should not be able to make a mistake,once array is made install os(I am not sure if you can set os first then set drives to mirror after rtfm time
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http://www.pctechguide.com/tutorials/RAID.htm