I don't know about the Duo, but I have an NV running RAIDiator 4.1.6 and I recently replaced a drive with a WD1001FALS. The drive showed up as dead in Frontview. When I downgraded RAIDiator to 4.1.4, the drive was recognized, initialized, and synced automatically. After that, I upgraded back to 4.1.6 and it's been working ever since (~1 week so far).
Hope that helps,