SMART data whilst on RAID isn't available apparently, though my last RAID 1 set up, which was 2 Seagate Barracuda 7200.12 drives, came up with a SMART error. That is when I decided to start afresh with a new Windows/1TB drives. Didn't exactly work out
Though the drives as non-RAID drives both pass at the moment. Quick/Extended tests passed.
The only worry I have is that since the drives have just 0's on them, there's not really much to test with...