This item is brand new only taken out to test it worked then realised its not needed, here is some info from another site
Startech 4 Bay External HDD RAID Tower
The SAT3540U3ER 4-Drive USB 3.0/eSATA to 3.5" SATA RAID Enclosure is a high-performance external RAID storage solution that supports up to 4 high capacity (tested with up to 4TB per bay) 3.5-inch SATA hard drives over a USB 3.0 or eSATA connection.
The 4-bay RAID enclosure can be connected to the host/source computer through USB or eSATA 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 enable you to customize the speed of the fan as necessary to ensure suitable operating temperatures for optimized drive performance.
The StarTech.com Advantage
Support for up to 4 drives provide large amounts of storage with a choice of high speed interfaces from USB 3.0 or eSATA
The removable front cover and accessible drive bays allows drives to be replaced easily in case of failure or a system upgrade
Built-in support for numerous RAID modes for most personal/business needs and an 80mm controllable cooling fan to keep drives from overheating
Specifications
Product Description StarTech.com 4 Bay External Hard Drive Array RAID Tower - eSATA USB 3.0 Enclosure Hard drive array
Device Type Hard drive array
Number of Drive Bays 4
Host Interface USB 3.0/ eSATA
External Connectors 1 x USB 3.0 type B female, 1 x eSATA female, 1 x DIN power connector
Fans 1 x 80mm
Compatible Hard Drives 3.5” SATA Hard Drives
Maximum Data Transfer Rate USB 3.0: 5 Gbps, eSATA: 3 Gbps
RAID Modes Span, 0, 1, 3, 5, 0+1
Power Adapter 12V DC, 5000mA, 4-pin DIN plug
Dimensions (WxDxH) 6.8 cm x 9.8 cm x 1 cm
Weight 50 g
OS Compatibility Windows XP/ Server 2003/ Vista/Server 2008 R2/ 7 (32/64-bit),Mac OS X, Linux
Manufacturer Warranty 2 years warranty
Startech 4 Bay External HDD RAID Tower
The SAT3540U3ER 4-Drive USB 3.0/eSATA to 3.5" SATA RAID Enclosure is a high-performance external RAID storage solution that supports up to 4 high capacity (tested with up to 4TB per bay) 3.5-inch SATA hard drives over a USB 3.0 or eSATA connection.
The 4-bay RAID enclosure can be connected to the host/source computer through USB or eSATA 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 enable you to customize the speed of the fan as necessary to ensure suitable operating temperatures for optimized drive performance.
The StarTech.com Advantage
Support for up to 4 drives provide large amounts of storage with a choice of high speed interfaces from USB 3.0 or eSATA
The removable front cover and accessible drive bays allows drives to be replaced easily in case of failure or a system upgrade
Built-in support for numerous RAID modes for most personal/business needs and an 80mm controllable cooling fan to keep drives from overheating
Specifications
Product Description StarTech.com 4 Bay External Hard Drive Array RAID Tower - eSATA USB 3.0 Enclosure Hard drive array
Device Type Hard drive array
Number of Drive Bays 4
Host Interface USB 3.0/ eSATA
External Connectors 1 x USB 3.0 type B female, 1 x eSATA female, 1 x DIN power connector
Fans 1 x 80mm
Compatible Hard Drives 3.5” SATA Hard Drives
Maximum Data Transfer Rate USB 3.0: 5 Gbps, eSATA: 3 Gbps
RAID Modes Span, 0, 1, 3, 5, 0+1
Power Adapter 12V DC, 5000mA, 4-pin DIN plug
Dimensions (WxDxH) 6.8 cm x 9.8 cm x 1 cm
Weight 50 g
OS Compatibility Windows XP/ Server 2003/ Vista/Server 2008 R2/ 7 (32/64-bit),Mac OS X, Linux
Manufacturer Warranty 2 years warranty
