Saravanan Kandhallu :
It's 2 Bay with Raid 0,1,5 Support..And It comes with HDMI Support too...
If it's a 2-bay NAS, it couldn't support RAID 5 because RAID 5 can be build with at least 3 HDDs.
So if your only option is a 2-bay NAS you can choose between RAID 1 (mirror) and RAID 0 (stripe).
But what do you plan to use the NAS for? Are you looking for speed and performance for editing or gaming or is it simply an additional location with your data which you can access from your computers and other devices?
The HDMI interface is there to help you easily stream movies from the NAS to your TV, but it doesn't really have anything to do with the array configuration itself.
I'm asking because a lot of customers jump into RAID-ing when there might be a simpler storage solution for your data.
SuperSoph_WD