The TowerRAID TR5UT-B is a hardware RAID 5 five bay enclosure that utilizes the widely available USB 2.0 and performance orientated eSATA to provide over 200MB/s performance. Build-in support for RAID 0, 1, 10, 3, 5 with hot-spare support and JBOD, TR5UT-B provides hardware RAID redundancy protection against hard drive failure. New RAID mode, CLONE mode or N-Way Mirror, are introduced to support same copy of the data in all of the hard drives installed. Since RAID engine is embedded in the enclosure, all RAID parity calculation will be offload to the unit, instead of using the controller card or computer to provide high performance storage. Hardware RAID enclosure also eliminates OS compatibility issues, since no software is required. In order to satisfy the need for performance hungry application, each unit is bundled with PCIe 2.0 x1 two ports eSATA controller card with SATA 6.0 Gbps (6G) support (Highpoint Tech R622 Controller card). PCIe 2.0 provides twice the bandwidth of PCIe 1.0 unit, allowing over 200MB/s performance in PCIe 2.0 support slot. The backward compatible with PCIe 1.0 slots allow using the unit in any PCIe slot, to provide eSATA connectivity for the computer without eSATA build-in. Designed with easy installation in mind, TR5UT-B comes with 5 easy to install hard drives trays and dust-free protective ventilating cover. TR5UT-B is the ultimate eSATA RAID 5 storage for all of your storage need.