Quality Solutions. Expert Support. Since 1988.

SHOP ALLOpen Shop All Drop Down Menu

Other World Computing - MacSales.com

We're sorry, but this item is no longer for sale. However, there may be more External Drives and Enclosures items available.

This was an Open Box product listing. For more great deals on Open Box, Refurbished and Used items, keep an eye on our Garage Sale page. Or join our email list and be the first to know when new items become available!

We sell this item brand new for $267.99, view our listing.


Mercury Elite Pro Dual
Performance RAID Enclosure

New Condition | Open Box

Mac / PC / Thunderbolt 2 / USB 3.1 Gen 1 / RAID
With Thunderbolt 2 and USB 3.1 Gen 1
Professional Grade Solution
Dual Drive Professional Hardware RAID
The next generation Mercury Elite Pro Dual with Thunderbolt 2 technology is the perfect RAID solution for creative workflows, project archives, and system backups. Inside are two drives, easily configured in RAID 0, 1, span, or independent mode.
Don't Wait. Don't Worry.
Thunderbolt 2 technology unleashes the full potential of two 3.5" hard drives. In RAID 0 you'll experience the maximum sustained throughput from your drives with speeds up to 474MB/s, fast enough to support compressed 4K workflows. Configure the Mercury Elite Pro Dual with Thunderbolt 2 technology in RAID 1 mode and enjoy instant mirroring of your data. Experience the freedom to create without wait or worry.
Ready for You Right Out of the Box
Mercury Elite Pro Dual with Thunderbolt 2 technology features two Thunderbolt 2 ports, one USB 3.1 Gen 1 port, and all of the cables you need for use with almost any system. Ready to perform in RAID 0, it's also easily configured in RAID 1, span, and independent modes to match your workflow needs.
Make more connections
With dual Thunderbolt 2 ports, Mercury Elite Pro Dual with Thunderbolt 2 technology supports Thunderbolt daisy-chains. Expand your workstation with up to five additional Thunderbolt devices, including high-speed storage, expansion chassis for specialist workflows, even a high-definition display.
Quality and support you can trust
The Mercury Elite Pro Dual with Thunderbolt 2 technology features a heat-dissipating, brushed-aluminum design with a whisper-quiet, high-performance fan. In addition, smart power conserves energy and extends the life of the drives inside. The Elite Pro Dual automatically spins down during periods of inactivity, and powers on and off with your workstation. Extraordinarily durable and efficient, the Mercury Elite Pro Dual with Thunderbolt 2 technology is built to seamlessly integrate with any work environment from large-scale, high demand production studios to your home office.

Product Specifications:

Software Requirements

  • OS
    • Thunderbolt
      • OS X 10.9.3 or later
      • Windows 7 or later
    • USB 3.1 Gen 1
      • OS X 10.6.8 or later
      • Windows XP or later
  • Driver
    • Driver not required for OS X
    • Driver not required for Windows

Hardware Requirements

  • Minimum
    • Mac or PC featuring Thunderbolt or USB 2.0 interface
  • Recommended (Best Performance)
    • Mac or PC featuring Thunderbolt 2 or USB 3.1 Gen 1 interface

Bootability 1

  • Thunderbolt: Any Mac that supports booting via Thunderbolt
  • USB: Any Mac that supports booting via USB 2

Interface (Chipset)

  • (2) Thunderbolt 20Gbps
  • (1) USB 3.1 Gen 1 (ASMedia ASM1153E)
  • SATA controller (ASMedia ASM1062)
  • RAID controller (ASMedia ASM1092R)

UASP (USB Attached SCSI Protocol) Compliant

  • Yes

Drive(s) Supported 3

  • (2) 3.5" SATA 6Gb/s drives
  • (2) 2.5" SATA 6Gb/s drives 4
  • SATA revision 3.0 (6Gb/s) compliant
  • Compatible with SATA revisions 2.0 (3Gb/s) and 1.0 (1.5Gb/s)


  • Thunderbolt 2
    • Compressible Data: 474 MB/s Read and 474 MB/s Write
    • Incompressible Data: 410 MB/s Read and 405 MB/s Write
  • USB 3.1 Gen 1
    • Compressible Data: 416 MB/s Read and 393 MB/s Write
    • Incompressible Data: 386 MB/s Read and 393 MB/s Write
  • Note(s)
    • Speeds will vary based on drives used, setup, and other factors.

RAID Modes Supported

  • Hardware
  • RAID 0, 1, SPAN, and Independent drive mode

Initial Configuration

  • Empty


  • Power Supply
    • External UL-listed universal auto-switching
    • AC input: 100 ~ 240V, 50/60Hz
    • DC output:, 12V @ 6A
    • Replacement power supply sold separately
    • Adapter plugs for international use sold separately


  • Environmental (Operating)
    • Temperature (°F) 32° — 107°
    • Temperature (°C) 0° — 42°
  • Environmental (Non-Operating)
    • Temperature (°F) &min;40° — 149°
    • Temperature (°C) &min;40° — 65°


  • 135 mm (5.3 in)


  • 72 mm (2.8 in)


  • 226 mm (8.9 in

Weight (without drives)

  • 1.1 kg (2.5 lbs.)

1. Booting in RAID 0, RAID 1, and SPAN mode are supported via Thunderbolt 2 and USB 3.1 Gen 1. Thunderbolt 2 also supports Independent mode booting.

2. When connected via USB, the following limitations apply when booting in Independent mode: if both drives are installed, only the disk connected to the 'Drive A' cables will boot. If only one drive is installed, the disk will boot regardless of which set of cables it is connected to. Please check the Assembly Manual & User Guide for more details.

3. Not compatible with the following Seagate drive: Seagate ST8000NM0055, part number 1RM112-102, AND firmware version PN02. Please note that drives with the same model number but different firmware DO work correctly.

4. 3.5 inch to 2.5 inch SATA drive adapter required. Adapter not included.
Manufacturer provided specifications for Other World Computing p/n TB2U3MED0GB UPC#: 812437023961



  • Mercury Elite Pro Dual high performance enclosure
  • 0.6 meter (24 in) USB 3.1 Gen 1 Cable (Standard-A to Standard-B)
  • 1.0 meter (39 in) Thunderbolt cable
  • External power supply and power cable
  • Screw packet
  • Quick Start Guide
  • Assembly Manual & User Guide (Download Only)

Customer Ratings

Write a Review 5 / 5 2 out of 2 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: arob Location: Colorado Age: 55-65 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Great product, super service! March 9, 2017 My Mercury Elite Pro Dual arrived with the cable for the LED on the front panel disconnected. I didn't notice this, but did notice no LED when I powered on first time.

I got a call from OWC (Cynthia) out of the blue a day later and she was able to guide me through the issue. Apparently, a batch came from the assembly line like this and they didn't catch them all... no biggie.

I dropped a Seagate 2TB SSHD in slot 1 (my boot drive), and a 3TB WD drive in the second slot. I then installed macOS, migrated my Time Machine backup to the 2TB drive, and booted to my familiar Mac Pro 3,1 settings on a new Mini (2014 model). The 3TB drive contains an extensive iTunes media library (too big for the boot drive I had on Mac Pro), and everything worked flawlessly. The boot time for the SSHD is slightly faster than the 5400rpm drive on the mini, but once booted, it is far faster launching apps and documents than the native drive. I suspect this boot delay is due to the OS detecting the external Thunderbolt connected drives before initiating the boot sequence. Certainly not as fast as SSD, but then the cost of 2TB SSHD vs 1TB SSD is a significant savings worth a few extra seconds of boot time.

The 3TB drive is infinitely faster access, load and write than when it was internal on the Pro (SATA1). And copying files from the two drives in the Mercury Elite is lightning fast.

I was not interested in RAID, instead I wanted a fast external drive for booting (to avoid tearing the mini apart to replace the HDD), and a fast external drive for my media library. This product meets the needs flawlessly.

Some have commented on fan noise. Yes, the fan does make a bit of noise, but not so much that it is disturbing. Eventually, this unit will go in a ventilated cabinet that will mute the noise, so this is not a concern for me.

I would recommend this item to a friend! Customer Videos:

Verified Buyer Top 250 Contributor
Reviewer: rmwpro Location: Costa Mesa, CA Age: Over 65 Experience Level: IT Professional Owned Product: 1-3 months
Rating: 5/5 This is my 4th one of these units March 7, 2017 The thunderbolt spends with tis I nRaid 0 are exceptional. I use attached USB3 drives to back them up.

I would recommend this item to a friend! Customer Videos:

Verified Buyer
Reviewer: EE1979 Location: Brookline, MA Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 3/5 A functional, basic, enclosure February 26, 2017 When I received this drive, I was a bit surprised that it wasn't a 2-bay version of the extremely versatile ThunderBay-4. The ThunderBay-4 is designed for drive hot-swap. Each drive is mounted in a rail-cage which is easily slid in/out of the enclosure. Installing drives the the Mercury Elite Pro Dual was not difficult, but required disassembly of the enclosure, screw-mounting drives and connecting cables (in a tight space). Two drives are installed so they sit atop one another. I'm concerned that this is less than optimal for cooling and may contribute to premature drive failure. Only time will tell. Overall, this is a reasonably priced enclosure, offering hardware Raid-0 and Raid-1. Its Thunderbolt-2 performance is as expected. My experience with OWC has always been positive and I expect they will stand behind their product.

I would recommend this item to a friend! This review is from OWC Mercury Elite Pro Dual USB 3.1 Gen 1 & Thunderbolt 2 RAID Storage Enclosure with cables. Customer Videos:

Verified Buyer
Reviewer: Aldingardurinn Location: Iceland Age: 35-44 Experience Level: Power User Owned Product: 3-4 months
Rating: 5/5 Exactly what I was lookin for February 20, 2017 I would recommend this item to a friend! This review is from 4.0TB Mercury Elite Pro Dual USB 3.1 Gen 1 & Thunderbolt 2 RAID Storage Solution - Solid-State Hybrid Drive. Customer Videos:
Verified Buyer Top 250 Contributor
Reviewer: arjay67ppp Location: Kankakee, IL Age: 45-54 Experience Level: Power User Owned Product: less than a month
Rating: 4/5 Great little box, fan could be quieter December 21, 2016 After reading several reviews of the previous model, I wasn't sure if the white noise of the fan would be an issue or not. Then I saw that the newer model was realized with Thunderbolt 2 support. So I pulled the pin and ordered one, along with a Neptune 480GB SSD, Adaptadrive sled, and a Toshiba 4TB HD. Now I feel like I have the iMac that I should have had all along. BIG storage from the 4TB HD, and super speed from the SSD.

My iMac came with a conventional HD installed. Since it's a Late 2015 model, swapping it out would be a pain. So initially I got a Mercury Elite Pro Mini enclosure with an SSD inside. I set that up as my system drive and that alone was a significant improvement in boot time and program loading.

But along comes this little screamer. After I set it up and cloned my existing system drive to the SSD, boot times improved by around 7 seconds. (and I was pretty happy with the USB3 enclosure) Both Apple apps and MS Office apps load a lot faster also. I don't have hard benchmarks on those, but app load time is about perception. My perception is that I will wait a lot less with this baby.

It's a well made box also. The drive mounting assembly and the outer case are all metal. I was actually a bit surprised when I first unboxed it as it was a bit heavier than I expected. It was also a bit smaller than I expected. Length-wise it's a couple inches longer than your standard 3.5" HD. But the height and width are just slightly more. The small footprint makes it easy to stash just about anywhere. All the mounting holes line up beautifully and installation was quite easy. The hardest part was reading the labels for which channel was A or B. (yep, had to grab my glasses for that--50 year old eyes)

Ah, but the fan noise. It's noticeable in a quite office such as mine. But it's not loud enough to be an irritation. What is most noisy is my selection of 4TB HD that I put in. So if you have quieter HD's or load it with SSD's only it should be better. I would suggest OWC employ the wisdom of Apple in this regard though. When my fans kick up on my iMac, I can barely hear them at all.

I would recommend this item to a friend! This review is from OWC Mercury Elite Pro Dual USB 3.1 Gen 1 & Thunderbolt 2 RAID Storage Enclosure with cables. Customer Videos: