WD My Book Thunderbolt Duo 4 TB Dual Drive High-speed Storage with RAID - 2 x HDD Supported - 4 TB Installed HDD Capacity - RAID Supported 0, 1, JBOD, 1, JBOD - 2 x Total Bays - External

My Book® Thunderbolt� Duo dual-drive storage system delivers the optimum fusion of performance and capacity. This drive offers two Thunderbolt� ports delivering the revolutionary data transfer speeds available only with Thunderbolt technology. Daisy chain multiple devices through My Book Thunderbolt Duo and enjoy nearly unlimited flexibility and performance in your creative life.