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The My Book Thunderbolt Duo represents Western Digital's first external hard drive with Thunderbolt integration. Two HDDs are within each enclosure, and WD offers both 4TB and 6TB configurations. Users can also opt to remove the preinstalled drives and swap in their own. Dual Thunderbolt ports allow for daisy chaining with additional peripherals.


  • Status: Available
  • Availability date: Mar. 15, 2012
  • Price at launch: $599.99


  • Alias: WDBUPB0040JSL, WDBUPB0060JSL

Also Known As...

  • SKU description: 4TB, 6TB

Pricing / SKUs

  • Width: 3.9 inches
  • Depth: 6.2 inches
  • Height: 6.5 inches
  • Color: Silver


  • Total storage: 4 TB, 6 TB
  • Total drives / bays: 2
  • Media type: Hard Drive
  • RAID Support: RAID0, RAID1


  • Thunderbolt: 2


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