It’s a hard drive rack. You puts your hard drives in the cases, and it stores your datas on the disks. Is hard to understand? Yes, maybe, if there is a switch that lets you choose the RAID mode apparently on the fly. Is it intelligent and starts reorganizing your data, like a Drobo? Or is it dumb, and if you switch modes in the middle of a write, it corrupts your data? Since it costs less than $100, I’m going to guess dumb. It connects via SATA or USB and can hold (obviously) two hard drives.
The thing actually looks kind of cool, but I don’t trust it. Not one bit.
I’d say it’s dumb due to the recessed mode switch. Drobo is really the only one out there that switches behind the scenes.