Skip to: | | - A great place to buy computers, computer parts, electronics, software, accessories, and DVDs online. With great prices, fast shipping, and top-rated customer service - once you know, you Newegg.

If you are reading this message, Please click this link to reload this page.(Do not use your browser's "Refresh" button). Please email us if you're running the latest version of your browser and you still see this message. - Computer Parts, Laptops, Electronics, HDTVs, Digital Cameras and More!

PremierTry Message.
Home > 
Components > 
Hard Drives > 
Mac Hard Drives > 
Western Digital > 
Item#: 9SIA57Z3R66643

WD My Book Thunderbolt Duo 4TB 3.5" Thunderbolt Dual-drive Storage System Model WDBUPB0040JSL-NESN

  • Model WDBUPB0040JSL-NESN
  • Thunderbolt
  • 3.5"
  • 4TB

ICON Loading...
  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the Western Digital WDBUPB0040JSL-NESN


My Book Thunderbolt Duo


Formatted for Mac OS X Snow Leopard or Lion operating systems. Compatibility may vary depending on user's hardware configuration and operating system.



Physical Spec

Form Factor




Operating Systems Supported
Mac OS X Snow Leopard or Lion


System Requirements
Computer with Thunderbolt connector
Mac OS X 10.6.8 or higher
Thunderbolt cable (must be purchased separately)
Dimensions: 6.5" x 6.2" x 3.9"

Move data at unprecedented speeds

High-speed multi-tasking

User-configurable RAID for speed or double-safe data protection

Daisy chain several drives together for even faster speed

Configurable for maximum speed (RAID 0), data protection/mirror mode (RAID 1) or use the drives individually in JBOD mode.

High-capacity storage


WD Drive Utilities
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 90 days
  • Limited Warranty period (labor): 90 days
  • Read full details

Customer Reviews of the Western Digital WDBUPB0040JSL-NESN

Do you own this product? Write a Review

ICON Loading...

Filter Results

  • ALAN S.
  • 8/3/2015 8:43:40 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat Time Machine

Pros: Easy to reconfigure to RAID 1 for Time Machine
RAID 1 drives are hot swappable
Thunderbolt allows up to 5 devices to daisy chain
Good value

Cons: None so far

Other Thoughts: I reconfigured the Duo tp Raid 1 to use for system backups. With redundant on site backups and a cloud backup I feel my data is pretty safe. The Duo has been running iMac Time Machine backups for several weeks without a hiccup. Backups are so fast and seamless I never know they are happening unless I happen to notice the LED on the front of the Duo flickering.

Currently the Duo is daisy chained down stream from a 3TB Thunderbolt 2 drive. Both drives work flawlessly.

I'm so satisfied with this drive that I am strongly considering getting another to leave in RAID 0 for rendering video.

Did you find this review helpful? Yes No

  • Robert R.
  • 9/15/2014 5:59:21 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsFast , Cheap , Fast

Pros: Very Fast transfer rate for large transfers. Easily change RAID settings. Pre-Formatted for MACs.
Very quiet and runs cool

Cons: None so far, Does NOT include Thunderbolt cable... and this is the only type of connection port ( 2 ) on the drive. No USB or Firewire

Other Thoughts: Great deal on refurbished unit. I was a bit hesitant buying a "refurbished " storage drive unit, But the cost of this drive new was prohibitive for me.
This drive is working great so far. I just hooked it up, set my RAID preference to RAID 1 ( mirrored drives ) in the easy to use UI, ran a Time Machine backup, and transferred about 140GB of photos and videos in no time!

Did you find this review helpful? Yes No

ICON Loading...
Selected Items
Are you an E-Blast Insider? Subscribe Newegg e-Blast
Shop without retyping payment details. Secure shopping made faster.
Check out with PayPal.
Home > 
Components > 
Hard Drives > 
Mac Hard Drives > 
Western Digital > 
Item#: 9SIA57Z3R66643
If the Adobe Reader does not appear when you click on a link for a PDF file, you can download Adobe Reader from the Adobe web site.