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WD My Book Thunderbolt Duo 4TB External Dual Hard Drive WDBUPB0040JSL, Silver 4TB HDD While this drive has beenThe Western Digital WDBUPB0040JSL 4TB My Book Thunderbolt Duo is a dual drive storage system with two Thunderbolt ports capable of up to 10 Gb s data transfer rates. The system supports user selectable RAID 0 and RAID 1 modes, as well as JBOD modes. Plus, since Thunderbolt ports are bidirectional, they afford high speed multitasking. You can also daisy chain multiple devices or peripherals using the two Thunderbolt ports for better efficiency and