Turn 4 SATA hard drives into external RAID storage that connects over USB/ Fire Wire/e SATA Support for up to 4 drives provide large amounts of storage with a choice of high speed interfaces from USB (Universal Serial Bus) 2.0, Fire Wire 400/800 or e SATA The removable front cover & accessible drive bays allows drives to be replaced easily in case of failure or upgraded Built-in support for numerous RAID modes for most personal/business needs & an 80mm controllable cooling fan to keep drives from overheating Star Tech.com''s 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 & SATA III-6 Gbps). The 4-bay RAID enclosure can be connected to the host/source computer through USB (Universal Serial Bus), e SATA or Fire Wire & automatically builds your SATA RAID array based on your selection (Spanning, RAID 0, RAID 1, RAID 1+0, RAID 3, & 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 & simple hard drive status & 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. WhatÂ’s in the box Four drive HDD enclosure e SATA Cable USB (Universal Serial Bus) Cable 6 pin Fire Wire cable 9 pin Fire Wire cable Screw driver & screw kit Power Cord (NA/ UK/ EU) Universal Power Adapter Instruction Manual