Turn 4 SATA hard drives into external RAID storage that connects over USB/FireWire/eSATA The S354UFER External SATA RAID Enclosure is a high-performance external RAID storage solution, supporting up to 4 high capacity (tested with up to 4TB per bay) 3.5" SATA hard drives (supports SATA, SATA II and SATA III-6Gbps). The 4-bay RAID enclosure can be connected to the host/source computer through USB, eSATA or FireWire and automatically builds your SATA RAID array based on your selection (Spanning, RAID 0, RAID 1, RAID 1+0, RAID 3, and RAID 5 supported), delivering a simple, yet flexible external storage solution. Designed for convenience, the enclosure features front panel LED indicators that provide RAID information and simple hard drive status and activity monitoring. The enclosure also features a built-in 3-speed 80mm fan with automatic or manual controls that allow you to customize the speed of the fan as necessary, ensuring suitable operating temperatures for optimized drive performance.