WD My Book Thunderbolt Duo 4TB External Dual Hard Drive WDBUPB0040JSL, Silver


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The 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 productivity. For added convenience, the drives are user-serviceable and the system comes with the WD Drives Utilities software.

The WD My Book Thunderbolt Duo dual-drive storage system gives you the ideal combination of performance and capacity. And thanks to two Thunderbolt ports you get the superior data transfer speeds that only Thunderbolt technology can offer. Daisy-chain multiple devices through My Book Thunderbolt Duo and enjoy nearly unlimited flexibility and performance in your creative life.



  • Revolutionary Thunderbolt technology with two Thunderbolt ports for high-speed data transfer
  • Dual-drive storage system with user-selectable RAID 0/1 that automatically duplicates your data
  • Compatible with Time Machine
  • User serviceable hard drives
  • WD SmartWare automatic continuous backup software
  • HFS+ formatted
  • Daisy-chain multiple devices like HD monitors, video and audio editors and media players for nearly unlimited productivity
  • Handle video editing, 3D rendering and other graphics-intensive projects simultaneously
Capacity 4TB
Interface Thunderbolt Ports x 2
Drive Speed Green Powered (variable rpm)
Data Transfer Rate 10 Gb/s (maximum)
System Requirements Mac OS X 10.6.8 or higher
Computer with Thunderbolt connector
Thunderbolt cable (sold separately)
Configuration RAID 0 (max speed)
RAID 1 (data protection/mirror mode)
JBOD (use drives individually)
Power Requirements AC 100 - 240V (47 - 63Hz)
Operating Temperature 41 to 95°F (5 to 35°C)
Non-Operating Temperature -4 to 149°F (-20 to 65°C)
Dimensions (WxHxD) 3.9 x 6.5 x 6.2" (9.9 x 16.5 x 15.7 cm)
Weight 4.73 lb (2.15 kg)
Condition Manufactory Refurbished 
Warranty 6 Months 

Product Condition Grading, Recertification, and Refurbishment Information

The following products are Refurbished and given a Grade based on Physical Condition (Unless otherwise stated in product description).


Grade 'A' – Looks like NEW.
Grade "B" - Fully functional, slight cosmetics scratches.
Grade "C" - Fully Functional, have 3 or more cosmetics scratches, some of them are really deep.
Graded Refurbished Products come with warranty stated in product description.

Sold in perfect working order & have passed a thorough testing process.
These products are in GOOD CONDITION & come complete with all packaging & accessories (unless otherwise stated).
Will have some cosmetic blemishes Please note that these products will be shipped in plain packaging.
Graded Refurbished Products are tested thoroughly and in working condition. Items will have some cosmetic blemishes. Comes with Warranty stated in product


The following products are Refurbished and Recertified to Manufacturer Specifications (Unless otherwise stated in product description).

External Hard Drives
Internal Hard Drives
Security Cameras
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WD My Book Thunderbolt Duo 4TB External Dual Hard Drive WDBUPB0040JSL, Silver