SANS DIGITAL EliteRAID ER104UT+B 0, 1, 10, 3, 5, Clone (N-way Mirror) with Hot Spare and JBOD 4 x Hot-Swappable 3.5" Drive Bays USB 3.0 (backward compatible with USB 2.0) and eSATA 1U 4 Bay USB 3.0 / eSATA Hardware RAID 5 Rackmount (Black)