WD20EARS just added on the official HCL - mistake and issues

Hello all, newbie here. I've been playing with the ReadyNAS DUO for the past couple of weeks and found out quickly that 500Gb is not a whole lot of space when you're trying to back up your dvd collection. So when the WD20EARS showed up on the HCL, I jumped on a deal @ ZZF (only $134 or so). First time I installed it, nothing happened. I frantically searched this forum for some answers, so I did what robUx4 did. I installed RAIDiator 4.1.7beta. I have never used anything beta. But after ~20 hours of initializing, I finally have my 2 WD20EARS in redundant X-RAID. Too bad I can use only 1.862 Tb of the full 2 Tb. I'll be searching around some more for ways to increase the hard drive capacity, unless someone here can tell me how. Anyways, just wanted to thank people for great support.