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Item#: 9SIA2F83373207

WD My Passport Pro 4TB portable RAID storage with integrated Thunderbolt cable Model WDBRNB0040DBK-NESN

  • Dual-drive RAID storage, No AC adapter required
  • Up to 233 MB/s data transfer rates, Integrated Thunderbolt cable
  • Durable aluminum enclosure
  • 3-year limited warranty
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Learn more about the Western Digital WDBRNB0040DBK-NESN


My Passport Pro


Formatted HFS+J for Mac OS X Mavericks and Mountain Lion.

Note: Compatibility may vary depending on user’s hardware configuration and operating system.




Thunderbolt 10Gb/s


Dual-drive RAID storage offers speed or data protection

Transfer rates as high as 233 MB/s keep your creative sessions flowing

Integrated Thunderbolt cable eliminates the need for an AC adapter and ensures against lost cables

Durable aluminum enclosure helps protect the drive inside and stands up to your on-the-go lifestyle

User-selectable RAID 0/1 or JBOD lets you select for more speed, data protection or two independent

Ideal for:
-Transferring files while in the field with the amazing speed of the Thunderbolt interface
-Carrying with you on your creative adventures to instantly save your creations
-Saving, editing and compiling files with the blazing speed of RAID 0
-Protecting your files with RAID 1 to instantly have a duplicate copy of your flles
-Connecting to your MacBook through the integrated Thunderbolt cable
-Complementing your professional style with a beautiful ID and , stylish and durable, aluminum enclosure
-Saving up to 4 TB of creative files on this dual-drive storage device
-Connecting and powering through your Thunderbolt interface
-Backing up your files with Apple Time Machine


Package Contents
Portable hard drive
Integrated Thunderbolt cable
Quick install guide

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the Western Digital WDBRNB0040DBK-NESN

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  • Brian B.
  • 3/1/2015 7:56:56 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggs

This review is from: WD My Passport Pro 4TB portable RAID storage with integrated Thunderbolt cable Model WDBRNB0040DBK-NESN

Pros: Very fast - redundant disks. Easy to use. Completely bus powered, which is nice. Redundant disks allow for RAID use.

Thunderbolt cable is integral to the unit, and has a neat holder moulded into the case.

Cons: Runs fairly warm. Has a small fan to keep the unit cool that makes a bit of noise.

Unit is actually a pair of 2T disks in a RAID 0, which increases the likelyhood of a non-recoverable failure. I did not experience a failure, but I did reformat mine to a RAID 1 (for redundancy), which drops the capacity from the advertised 4T to only 2T.

Only Thunderbolt connectivity, no USB or ethernet.

The integral cable holder is a big snug, and if a problem develops with that cable there's no easy way to replace it.

Other Thoughts: Expensive for the capacity, but it's fairly speedy. I didn't run any benchmarks - it can't compare to the speed of internal SSD, but it's certainly comparable to the speed of a internal HDD. Runs a bit on the warm side, and the fan noise could drive you crazy if you kept it plugged in all the time, but makes for a nice addition if you need temporary capacity with good speed.

No other connection options limit this to Thunderbolt-equipped PCs/Macs, and it comes pre-formatted for OS X.

Marketing is a bit misleading - unit is actually dual 2T drives. It comes pre-formatted as an OS X RAID 0 array at 4T. Not entirely dishonest, but not entirely accurate either.

Overall I like the unit, it serves the function I need - temporary high speed storage. The only real complaints I have is with the integral fan noise being noticable, and my doubts about the longevity of the integral Thunderbolt cable.

Did you find this review helpful? Yes No

  • Reid E.
  • 2/26/2015 9:49:56 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsExcellent portable drive

This review is from: WD My Passport Pro 4TB portable RAID storage with integrated Thunderbolt cable Model WDBRNB0040DBK-NESN

Pros: Fast! Thunderbolt delivers great speed. I have mine set up as a RAID-0 for maximum throughput. All the data on the drive is from other sources, so I'm not overly concerned about losing it. If you are, you should think about RAID-1 instead.

No external power chord. Just plug in to laptop and go!

Large capacity. 4 TB is more than I dreamed I'd have so soon.

Cons: Thick. Heavy. No Thunderbolt port.

The drive is about the same length and width as a normal WD Passport drive, but twice as tall, made of metal, and quite hefty.

The lack of a Thunderbolt port means that you lose one Thunderbolt port when you plug the drive in.

The size/weight issues are minor quibbles. But the missing Thunderbolt port for daisy-chaining is why I only rate the drive at 4 / 5.

Other Thoughts: The design is quite good, with the Thunderbolt cable permanently attached to the drive, but tucking in along the groove on the edges of the drive.

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Computer Hardware > 
Hard Drives > 
Mac Hard Drives > 
Western Digital > 
Item#: 9SIA2F83373207
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