If you got the WD Caviar Black, then it is unsuitable for a RAID array due to the power spin-down feature that's permanently enabled in the drive's firmware. This spindown - which would occur as frequently as possible, even when Windows is still running - would result in the drive(s) taking much too long to spin back up. This, in turn, would result in the RAID controller reporting the drives as "failed" even though they are both still good! As a result, all of the data on both drives in the array would be "permanently" lost, and cannot be recovered except by astronomically expensive data recovery services. (Sadly, the WD Black is not the only WD drive which suffers from this problem; the WD Green and newer revisions of the WD Blue also suffer from this problem.) The only way to prevent this (if you choose WD) would have been to purchase the RE editions of the drives, which currently cost as much as 40 to 50 percent higher per TB than comparably-sized consumer drives from other brands. However, if you did in fact get the WD Black, then just simply set them up as two separate volumes without RAID.