WD My Book Thunderbolt Duo 4TB External Dual Hard Drive WDBUPB0040JSL, Silver 4TB HDD You can also add a

You can also add a return-if-found message as the password prompt to help your My Passport drive find its way back to you if it ever accidentally gets left behind

In addition to these features

Plug and play

letting you focus on your music without the hassle

high-capacity storage to go

WD My Book Thunderbolt Duo 4TB External Dual Hard Drive WDBUPB0040JSL, Silver 4TB HDD You can also add aThe 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