Western Digital rolled out a 12 TB variant of its My Book Duo external drive, which debuted last month in capacities originally up to 8 TB. The new 12 TB model comes with a pair of 6 TB WD Red hard drives pre-installed, which you can either use as independent volumes, or stripe in RAID 0 for transfer rates as high as 290 MB/s. Other RAID modes supported include RAID 1 and JBOD. The drive plugs into the host over a single USB 3.0 connection. It features an additional two USB 3.0 downstream ports, so you can plug in additional drives.