Highlights Up to 6tb (not included) 2 x 10Gb/s Thunderbolt Ports 2 x Hot Swappable Hard Disks Daisy Chain Up to 6 Thunderbolt Devices Integrated Dual Cooling System Features The 2big 2-Bay Dual Thunderbolt Hard Drive RAID from LaCie is a versatile hard drive array capable of daisy chaining up to six Thunderbolt-compatible devices in low power mode. With 10Gb/s max uplink and downlink speeds you can transfer your data quickly and efficiently. Everything within this enclosure is kept cool with aluminum casing with a heat sink design as well as a high performance fan.

Please note this has no hard drives just the unit and power supply waiting for you to chuck some drives in it! Also does not have USB only thunderbolt!