Take the ever-expanding storage capabilities of Drobo BeyondRAID storage, throw in some Thunderbolt, and put it all into a small box and what do you have? Drobo Mini (US$649 MSRP, available for much less online).
To pack a lot of RAID-protected storage in a small space, Drobo chose to use 2.5" SATA laptop drives as the standard. There are four bays for drives in the Drobo Mini -- it comes empty, and you add drives of any capacity to fill 'em up. You can mix and match capacities, or even drop 2.5" SATA SSD or hybrid drives into the box for more speed. At this point, those 2.5" drives only come in capacities up to 1 TB, but as capacities increase in the future you'll be able to easily hot swap the "old" drives for
