Dual-Bay enclosure is designed to build an external RAID array with two 3.5" SATA hard drives and makes you to connect your computer through USB 3.0 or eSATA. Dual-Bay enclosure features a hardware RAID controller to obtain greater drive capacity or secure data redundancy. Enclosure has trayless removable hard disk slots and supports SATA III up to 6 GB/s for enhanced performance. Drive capacity: Currently tested with up to 4TB 7200 RPM 3.5" hard drives per bay (8TB total) and 2TB 5900 RPM 2.5" hard drives (2TB total). Interfaces/ports: 1- USB 3.0 B (9 pin, SuperSpeed) female, 1- eSATA (7 pin, data) female, drive connectors: 2- SATA data & power combo (7 + 15 pin) receptacle, host connectors: 1- USB 3.0 B (9 pin, superspeed) female. No. of expansion bays: 2. Drive installation: Removable, bus type: USB 3.0, drive size: 3.5", compatible drive types: SATA, number of internal 3.5" drives: 2. Maximum data transfer rate: 6 Gbps, type and rate: USB 3.0- 5 Gbit/s, UASP support, port multiplier, RAID, supported RAID modes: BIG (Spanning or Concatenation), hot swap capability. Performance: RAID modes: JBOD- (just a bunch of disks), RAID 0 (striped disks), RAID 1 (mirrored disks). Black. OS compatibility: Windows 8/8.1 (32/64bit), 7 (32/64bit), server 2008 (32/64), vista(32/64), server 2003 (32/64) XP(32/64), 2000, Apple mavericks (10.9) OSX mountain lion (10.8), Lion (10.7), snow leopard (10.6), linux, Google chrome OS. LED indicators: 1- HDD 1 activity, 1- HDD 2 activity, 1- RAID LED, chipset ID: Jmicron- JM562. Power source: AC adapter, input voltage: 110- 240 VAC, output voltage: 12 DC, output current: 3 A. Operating temperature: 5 to 35 deg C, storage temperature:-20 to 50 deg C, humidity: 20- 80% RH. Includes: 1- USB 3.0/eSATA Dual 3.5" SATA HDD trayless enclosure, 1- eSATA cable, 1- USB 3.0 cable, 2- drive bay keys, 1- universal power adapter (NA/UK/EU), 1- instruction manual. Certifications and standards: CE, FCC. See moreMAXIMUM COMPATIBILITY: The dual drive RAID enclosure supports all of the leading operating systems, including: Windows (8/7/Vista/XP/Server 2008/Server 2003), Apple OSX, Linux, and Chrome OS. SIMPLE INSTALLATION: For fast and easy drive installation and removal, the 2-bay hard drive enclosure features a convenient trayless system that eliminates having to mount and fasten your drives. to achieve greater drive capacity, or secure data redundancy. EXTENSIVE RAID FUNCTIONALITY: The eSATA hard drive enclosure's hardware RAID controller supports JBOD, Spanning, RAID 0, and RAID 1. FASTER SPEEDS: For fast performance and efficient data transfers, the trayless hard drive enclosure supports SATA III transfer speeds -- up to 6 Gbps when connected through eSATA.