Manufacturer’s Description

Drobo protects data from drive failure, allows incremental capacity increases, and eliminates the complexities of RAID based systems. Connects via FireWire 800 or USB 2.0. You can start with two drives and grow to four. To increase capacity, just add a SATA drive, or replace a drive with a larger one. It can support up to 16 terabytes in future.

Manufacturer’s Website