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OWC Mercury Pro U.2 Dual Dual-Bay Thunderbolt External Storage Enclosure for 2.5-inch and 3.5-inch NVMe U.2 Solid-State Drives and Adapters

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Blazing-fast NVMe SSD performance meets massive capacity in this compact, dual-bay Thunderbolt storage enclosure. It’s perfect for everything from routine backups to high-bandwidth pro creative uses.

Edit, Ingest, and Backup in a Blink

The Mercury Pro U.2 Dual is ready for you to install two NVMe U.2 SSDs, so you can edit high-res files on the fly, ingest and duplicate dailies without a hitch, rip through the tightest of timelines, and backup huge music and photo libraries in a flash. While it offers blazingly fast performance with massive storage capacity, this compact solution is small enough to easily fit on a DIT cart, in a rack, or on your desktop.

Nearly 6x Faster SSD Performance

NVMe U.2 SSD use began in the corporate and server market, where ROI is defined in nanoseconds and dependability is paramount. Now, the Mercury Pro U.2 Dual brings enterprise-level performance and reliability to your home or office. The NVMe SSDs utilize Thunderbolt’s full 2800MB/s of data bandwidth capability, so it functions nearly 6x faster than your typical SSD.1

Adaptable Flexibility

The Mercury Pro U.2 Dual easily handles any project backup and storage task you throw at it. Dual drive bays house NVMe U.2 SSDs, ready for the RAID level of your choice, to tackle nearly any data need imaginable. From personal videos to major motion pictures, from photo shoots to file backups… the Mercury Pro U.2 Dual gives you necessary the capacity and horsepower get the job done.

Reconfiguration Ready

Configure the Mercury Pro U.2 Dual to your liking, but you can rest assured that when you want to change your drive configuration for more RAID capabilities or additional storage capacity, there’s no need to buy a costly new enclosure. The Mercury Pro U.2 Dual is ready to change with you. Configure and reconfigure Mercury Pro U.2 Dual…
  • For cost-effective and streamlined RAID 0 and RAID 1 storage needs, configure each bay using a 2.5-inch or 3.5-inch NVMe U.2 drive; or configure each bay with an NVMe M.2 SSD with an M.2 to U.2 adapter, like the OWC ShuttleOne.
  • For more advanced RAID and capacity needs, configure each bay using an OWC U2 Shuttle with up to four NVMe M.2 SSDs per shuttle for a total of eight (8) SSDs.

Store More, See More, Do More

An extra Thunderbolt USB-C port lets you daisy-chain devices to your Mercury Pro U.2 Dual to expand your capabilities. Add up to five additional Thunderbolt solutions and merge them with a software RAID utility, such as OWC SoftRAID (available separately), for mind-blowing storage. Attach a 5K display or two 4K Thunderbolt displays. You can even place a USB device at the end of the chain. The Mercury Pro U.2 Dual gives you the freedom to use more of what you need.

More Powerful With SoftRAID

Need more power and protection? Choose a solution that includes OWC’s powerful SoftRAID RAID software.
SoftRAID is the most powerful, intuitive software RAID utility on the market. Multiple RAID levels let you select the RAID level that fits you or your project’s needs best. If you need maximum volume capacity, optimum drive performance, data protection, or a combination of attributes, SoftRAID has you covered.
Packed with features like drive validation, verification and failure prediction—SoftRAID includes features you simply don’t get with hardware RAID. It’s like having a datacenter on your desktop! From home users looking to protect photos and documents to professionals needing to protect and quickly access projects, SoftRAID is the perfect solution. Learn more about SoftRAID.


Start protecting yourself and your data today! Get all of SoftRAID’s great disk checking and monitoring features, plus the fastest and most efficient software RAID there is. Download and try SoftRAID for FREE.

Ready to Work Anywhere

The Mercury Pro U.2 Dual can be taken wherever you need a compact yet super-fast massive capacity storage solution. At 3.3”W x 5.8”H x 9.4”D and weighing just 4 pounds with drives, the Mercury Pro U.2 Dual can travel anywhere your workflow takes you. It connects to Thunderbolt Macs and PCs and can work cross-platform using OWC MacDrive 10 Pro software (available separately).
  1. Sequential read/write (max) performance based on testing Mercury Elite Pro U.2 Dual with 8 x 2TB Aura P12 SSDs in RAID 0 equipped connected to a MacBook Pro (16-inch 2019) with 64GB RAM and 2.4GHz i9 processor running AJA System Test (4K-Full resolution, 64GB file size, 10bit RGB codec, single file test). Each of the (2) U.2 drive bays are 2x PCIe lanes and support speeds of up to 1500MB/s. Max performance of 2800MB/s requires using both drive bays in a RAID 0 configuration.
  2. Requires use of DisplayPort to USB-C cable or adapter.
  3. Thunderbolt 2/Thunderbolt compatibility requires a certified Thunderbolt 3 (USB-C) to Thunderbolt 2 (mDP) adapter and a Thunderbolt 2 cable (available separately). This configuration provides data transfer at up to 20Gb/s but does not support notebook charging.


  • (1) OWC Mercury Pro U.2 Dual External Storage Enclosure
  • (1) External Power Supply and Power Cable
  • (1) 0.7M Thunderbolt Cable
  • (1) Quick Start Guide for OWC Mercury Pro U.2 Dual
  • (1) Assembly Manual & User Guide for OWC Mercury Pro U.2 Dual
  • 1 Year OWC Limited Warranty
  1. Thunderbolt 2/Thunderbolt compatibility requires a certified Thunderbolt 3 (USB-C) to Thunderbolt 2 (mDP) adapter and a Thunderbolt 2 cable (available separately). This configuration provides data transfer at up to 20Gb/s but does not support notebook charging.
  2. M.2 drives are also supported with M.2 to U.2 adapter such as the OWC U2 Shuttle and OWC U2 ShuttleOne (available separately).

Mechanisms Supported

  • 3.5-inch U.2 SSDs
  • 2.5-inch U.2 SSDs
  • NVMe M.2 SSDs via 2.5 or 3.5 inch U.2 adapter

Display Support

  • Up to one 5K display @ 60Hz,
  • or one 4K display @ 60Hz,
  • or one 4K display @ 30Hz

Display Support by Port

  • Thunderbolt 3: Up to 5K @ 60Hz via a native Thunderbolt 3 display or 4K @ 60Hz via a Thunderbolt display or a USB-C display adapter

Boot Support

  • Independent volumes bootable in macOS

Hot Plug Support

  • Yes


  • Thunderbolt 3: Intel JHL6540


  • BSMI
  • CE
  • FCC
  • RCM
  • VCCI

Data Transfer Rate (Maximum)

  • Thunderbolt 3 : Up to 40 Gb/s (or 5000 MB/s)

RAID Capable

  • Yes

RAID Levels Supported

  • RAID 0
  • RAID 1
  • JBOD
  • RAID 4
  • RAID 5
  • RAID 0+1

RAID Features

  • Software RAID

MTBF (Mean Time Between Failures)

  • Varies depending on drive mechanism installed

Contact Start Stops

  • Varies depending on drive mechanism installed

Mac OS Compatibility

  • macOS 10.13 High Sierra
  • macOS 10.14 Mojave
  • macOS 10.15 Catalina
  • macOS 11.x Big Sur
  • macOS 12.x Monterey

PC OS Compatibility

  • Windows 11
  • Windows 10 64-bit Edition
  • Windows Server 2016

Other Requirements

  • Requires 2.5 or 3.5 inch NVMe U.2 SSDs or U.2 adapters using the same form factors.

Host Port Requirements

  • Thunderbolt (USB-C) port (backward compatible with Thunderbolt 2/Thunderbolt1)

Driver Required

  • No

Power Supply

  • External UL-listed universal auto-switching power supply

AC Input

  • 100-240V, 50-60Hz, 2.0A

DC Output

  • +12V, 10A


  • 120W

External Power Adapter

  • Yes

Power Delivery

  • Two Thunderbolt 3 ports (15W each)

Number of Bays

  • 2

Device Ports

  • (1) Host Port – Thunderbolt 3 (USB-C) up to 40 Gb/s (5000 MB/s)
  • (1) Thunderbolt 3 (USB-C) Port


  • (1) 60mm 3,000RPM cooling fan

Security Slot

  • Yes

Power/Activity LED

  • Yes

Housing Color

  • Black

Housing Material

  • Aluminum


  • Height: 14.7 cm (5.8 in)
  • Length: 23.9 cm (9.4 in)
  • Width: 8.5 cm (3.3 in)


  • 1.5 kg (3.31 lbs)

Ambient Temperature

  • Operating: 41°F to 95°F (5°C to 35°C)
  • Non-Operating: -4°F to 140°F (-20°C to 60°C)


  • Operating: -304.8 m to 3,048.0 m (-1,000 ft to 10,000 ft)
  • Non-Operating: -304.8 m to 12,192.0 m (-1,000 ft to 40,000 ft)


  • Operating: 8% to 90% non-condensing
  • Non-Operating: 5% to 95% non-condensing


  • 32.4dB
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