Turn 4 SATA hard drives into external RAID storage, connected through USB 3.0 or eSATA SuperSpeed USB 3.0 host interface, with transfer rates up to 5 Gbps SATA revision 2 compliant eSATA host interface, supporting transfer rates up to 3.0Gbps Supported RAID modes: 0 (stripe), 1 (mirror), 3 (parity disk), 5 (striped parity), 10 (1+0), Span/Concatenation User-configurable, directly from the unit itself 80mm cooling fan with 4 selectable speeds: Low, Med, High, Auto Auto power-saving when host connection disconnected or turned off Removable front cover and accessible drive trays Rugged aluminum chassis Compatible with SATA revision 1/2/3 (1.5/3.0/6.0 Gbps) drives Supports 3.5" form factor SATA hard drives No driver or software installation Plug-and-Play and hot-swap compatible