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The Avastor XR4 RACK RAID series is designed for the most demanding storage applications. The XR4 trayless and tool-free design allows fast and easy installation of all four hard drives. At its heart is a user configurable hardware RAID engine that supports multi RAID functions to maximize speed and protection of your data. The USB 3.0, eSATA, FireWire 400 and 800 interfaces, provide you with unsurpassed data transfer performance. The XR4 is your best choice for a high capacity, high speed data transfer, rack mountable storage solution.