I have a couple stand-alone 2-bay RAID boxes (for use with DVR's and music servers). Both do fine with a pair of 1TB HDD's but neither can cope with 2TB HDD's. I don't want to replace both RAID boxes. Rather, I want to replace the internal raid controller, thus upgrading the boxes to be able to cope with 2TB HDD's. Does anybody know what I need to purchase to do this? If there are multiple options, which are the preferred choices? thanks...