The trayless hard drive enclosure lets you build an external RAID array with two 3.5” SATA hard drives and connect to your computer through USB 3.0 or eSATA. For fast performance and efficient data transfers, the eSATA hard drive enclosure supports SATA III transfer speeds -- up to 6 Gbps when connected through eSATA. The versatile SATA III external enclosure can also be connected through USB 3.0, with support for UASP, performing up to 70% faster than conventional USB 3.0 when paired with a UASP-enabled host controller. The external 2-bay hard drive enclosure features a hardware RAID controller, supporting JBOD, Spanning, RAID 0, and RAID 1 -- to achieve greater drive capacity, or secure data redundancy. The RAID controller is also front mounted for ease of access when changing your RAID mode. For fast and easy drive installation and removal, the dual drive RAID enclosure features a convenient trayless system that eliminates having to mount and fasten your drives, saving time and hassle. To ensure compatibility with your computer system, the trayless hard drive enclosure supports all of the leading operating systems, including Microsoft Windows (8/7/Vista/XP/Server 2008/Server 2003), Apple OSX (10.9/10.8/10.7/10.6), Linux, and Google Chrome OS. The eSATA hard drive enclosure is backed by a StarTech.com 2-year warranty and free lifetime technical support.