The RAID happens behind the scenes. You don't have to partition unless you need to have two volumes. If one drive fails, the drive will notify you and you'll replace the bad drive, but the data will be fine because it's 'duplicated' on two drives, thanks to RAID. All automatic.
You will not be able to use the drive with SuperDuper! if it's not HFS+. But if you want to use it otherwise, you can format it any way you'd like.
__________________
--Dave Nanian
|