![Used - Very Good: WD My Book Thunderbolt Duo 4TB Desktop External Hard Drive (WDBUTV0040JSL-NESN) Desktop External Hard Drives - Newegg.com Used - Very Good: WD My Book Thunderbolt Duo 4TB Desktop External Hard Drive (WDBUTV0040JSL-NESN) Desktop External Hard Drives - Newegg.com](https://c1.neweggimages.com/ProductImage/0B1-00HU-00006-06.jpg)
Used - Very Good: WD My Book Thunderbolt Duo 4TB Desktop External Hard Drive (WDBUTV0040JSL-NESN) Desktop External Hard Drives - Newegg.com
![Western Digital 3.5in 4TB My Book Thunderbolt Duo External Dual Hard Drive with RAID - WDBUPB0040JSL, Silver - Walmart.com Western Digital 3.5in 4TB My Book Thunderbolt Duo External Dual Hard Drive with RAID - WDBUPB0040JSL, Silver - Walmart.com](https://i5.walmartimages.com/asr/cd4483b6-2139-44a1-9abe-39d918e59821.1b657dc8c2800999eae9cd6257203386.jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF)
Western Digital 3.5in 4TB My Book Thunderbolt Duo External Dual Hard Drive with RAID - WDBUPB0040JSL, Silver - Walmart.com
![Western Digital 3.5in 4TB My Book Thunderbolt Duo External Dual Hard Drive with RAID - WDBUPB0040JSL, Silver - Walmart.com Western Digital 3.5in 4TB My Book Thunderbolt Duo External Dual Hard Drive with RAID - WDBUPB0040JSL, Silver - Walmart.com](https://i5.walmartimages.com/asr/6d9d1531-edcf-44af-b913-af7bda5b9306.5ae74f6af7cf6be285b5c6274143d41f.jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF)
Western Digital 3.5in 4TB My Book Thunderbolt Duo External Dual Hard Drive with RAID - WDBUPB0040JSL, Silver - Walmart.com
![Amazon.com: WD My Book Thunderbolt Duo 4TB External Dual Hard Drive Storage with RAID includes Thunderbolt cable WDBUSK0040JSL-NESN : Electronics Amazon.com: WD My Book Thunderbolt Duo 4TB External Dual Hard Drive Storage with RAID includes Thunderbolt cable WDBUSK0040JSL-NESN : Electronics](https://m.media-amazon.com/images/I/315fzYfl3lL._AC_.jpg)
Amazon.com: WD My Book Thunderbolt Duo 4TB External Dual Hard Drive Storage with RAID includes Thunderbolt cable WDBUSK0040JSL-NESN : Electronics
![Western Digital WDBUPB0040JSL - 4 TB Thunderbolt My Book Thunderbolt Duo (for Mac / Apple) External Hard Drive (HDD) - CPU Medics Western Digital WDBUPB0040JSL - 4 TB Thunderbolt My Book Thunderbolt Duo (for Mac / Apple) External Hard Drive (HDD) - CPU Medics](https://cdn11.bigcommerce.com/s-qfzamxn9kz/images/stencil/1280x1280/products/151309/228622/western-digital-wdbupb0040jsl-4-tb-thunderbolt-my-book-thunderbolt-duo-for-mac-apple-external-hard-drive-hdd-2__86948.1534979655.jpg?c=2)
Western Digital WDBUPB0040JSL - 4 TB Thunderbolt My Book Thunderbolt Duo (for Mac / Apple) External Hard Drive (HDD) - CPU Medics
![Western Digital's Thunderbolt Duo - A Tale Of Two Thunderbolt Storage Devices: Seagate's GoFlex Desk and Western Digital's Thunderbolt Duo Western Digital's Thunderbolt Duo - A Tale Of Two Thunderbolt Storage Devices: Seagate's GoFlex Desk and Western Digital's Thunderbolt Duo](https://images.anandtech.com/doci/5797/WD-My-Book-Thunderbolt-Duo-Back.jpg)