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Mercury Elite Pro Dual mini
480GB Bus-Powered Storage Solution

Mac / PC / Chrome / USB 3.1 Gen 2
Portable RAID Powerhouse
Mercury Elite Pro Dual mini is the latest high-performance portable RAID from OWC. Packing dual-drive, USB 3.1 Gen 2 performance into a portable, bus-powered form factor, this is the perfect drive for high demand applications on the go. With ample capacities, no matter where you are, Elite Pro Dual mini delivers the performance and flexibility to meet the most extreme workflow requirements for pros working with rich media content.
RAID for Redundancy. RAID for Performance.
Mercury Elite Pro Dual mini features easily user selectable modes RAID 0 and RAID 1. Choose the configuration that suits your needs. In RAID 0, experience blistering data transfer speeds up to 738MB/s. Or select RAID 1 for greater data redundancy from mirrored disks.
Good Looks meet Great Design.
A rugged aluminum chassis designed for near silent fanless, cooling, keeps your drives protected, cool and quiet everywhere you go. The slimline, side-by-side configuration means Mercury Elite Pro Dual mini fits easily in your laptop or gear bag. And because it's fully bus-powered, Mercury Elite Pro Dual mini is the perfect solution for your portable creative workflow.
Quality You Can Trust
Like all OWC drives, Mercury Elite Pro Dual mini is built to the highest standards of reliability and performance. Because 100% reliability is always the goal, Mercury Elite Pro Dual mini is rigorously quality tested, and backed by an OWC 3 year limited warranty and 24/7 customer support.

Product Specifications:

Software Requirements

  • OS (USB 3.1 Gen 1)
    • OS X 10.7 or later
    • Windows 7 or later
    • Chrome OS
  • OS (USB 3.1 Gen 2)
    • macOS 10.12 or later and Thundebolt 3 interface
    • Windows 8.1 or later
    • Chrome OS
  • Driver
    • Driver not required for OS X
    • Driver not required for Windows
    • Driver not required for Chrome
  • Driver
    • Driver not required for OS X
    • Driver not required for Windows
  • Hardware Requirements

    • Minimum
      • Mac or PC with a USB 3.1 Gen 1 port (Standard-A or Type-C)
    • Recommended (Best Performance)
      • Mac or PC with a USB 3.1 Gen 2 Type-C port

    Bootability 1, 2

    • OS X 10.7 or later

    Interface (Chipset) 3

    • (1) USB 3.1 Gen 2 / SATA RAID Controller (ASMedia ASM1352R)

    UASP (USB Attached SCSI Protocol) Compliant

    • Yes

    Standard Mechanism

    • Release Candidate (RC) firmware set

      There are two kinds of firmware for SSDs Mass Production (MP) and Release Candidate (RC). Prior to an MP firmware release, there are beta firmware releases and an RC firmware release. Often, the RC is the same as the MP release, however there can be small changes and bug fixes made between the two. OWC has evaluated the RC for the 6Gb/s SandForce 2281 Processor and found it to be stable with no issues reported during our testing. However, as with any evolutionary product, issues may surface as different usages and configurations are employed and it is important to understand that there will be further updates and revisions.

      Since no firmware update is currently offered for the OWC Mercury EXTREME Pro 6G SSD, no update page exists. To see the typical steps involved with a self performed field firmware update, please visit our 3Gb/s product update page at: http://eshop.macsales.com/Customized_Pages/Framework.cfm?page=sf_firmware.html

      It is important to note that the current firmware update tool requires the use of Windows XP/Vista/7. OWC is currently working on a Mac OS based update tool, but we do not have an exact availability date.

      240GB Mercury Extreme Pro 6G SSD Specifications:


      SandForce 228x Series Processor with 7% Over Provisioning
      Tier 1 Major Multi-Level Cell (MLC) High-Performance Sync-NAND Flash
      Form Factor
      Standard 7mm 2.5"
      SATA 6Gb/s, 3Gb/s & 1.5Gb/s supported, SATA 3.0 Compliant
      240GB useable capacity
      Total Flash Memory Components – 256GB
      16GB allocated to real-time data redundancy & error correction
      Formatted Capacity2
      RAID Support
      Qualified for single drive and multiple drive production workstation RAID 0/1/10/0+1 and SPAN usage.
      SMART Attributes
      Native Command Queuing
      up to 32 commands
      Manufacturer Model Number
      RoHS Compliant


      Height (max)
      7mm (0.276″)
      OWC 7mm ��� 9.5mm Adapter
      1 included (buy additional)
      Width (max)
      70.06mm (2.758″)
      Length (max)
      100.12mm (3.941″)
      77 grams +/- 2 grams
      0.170 lbs +/- 2.71 oz


      Data Reliability
      ECC Recovery: Up to 55 bytes correctable per 512-byte sector
      Chip Based Data Encryption: 128-bit AES-compliant
      TRIM Support
      OS Dependent
      Nonrecoverable Read Errors
      Less than 1 sector per 1016 bits read
      5 Year OWC SSD Limited Warranty
      (Standard return policy applies.)


      Reads 6Gb/s (up to)
      Writes 6Gb/s (up to)
      Reads 3Gb/s (up to)
      Writes 3Gb/s (up to)
      Read Incompressible
      Data Rate (up to)
      Write Incompressible
      Data Rate (up to)
      Random 4K Read4
      Up to 60,000 IOPS
      Random 4K Write4
      Up to 60,000 IOPS
      Read Latency
      less than 0.1ms
      Write Latency
      less than 0.1ms


      Read: 3000mW (3.0W) Maximum draw
      Write: 4500mW (4.5W) Maximum draw
      Less than 1000mW (1.0W)

      Environmental (Operating)

      Temperature (°F)
      32°F to 158°F
      Temperature (°C)
      0°C to 70°C

      Environmental (Non-Operating)

      Temperature (°F)
      -40°F to 185°F
      Temperature (°C)
      -40°C to 85°C


      Idle (Typical)
      0.0 bels
      Seek (Typical)
      0.0 bels
      1. 1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences. 
      2. In terms of standard gigabytes, 1GiB ≈ 1.074GB and refers to the actual formatted capacity of shown under Mac OS 10.5 or earlier and Microsoft Windows OS.
      3. Specific application environments such as temperature and duty cycle will affect the overall reliability.
      4. Specifications provided by SandForce.
      5. Temperature reporting is currently an unsupported feature because due to the operating characteristics of SSDs, it is highly unlikely one would ever exceed an OWC Mercury SSD's stated operating temperature ceiling of 158F/70C. However, we are looking into supporting this feature in the future via a firmware update. Firmware updates can be found here: http://eshop.macsales.com/tech_center/OWC/SSD.
      2 x 240GB* OWC Mercury Extreme Pro 6G Solid-state Drives**
      • *1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences.

        **OWC reserves the right to replace or upgrade to equivalent or better components.

    RAID Modes Supported

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

    Initial Configuration

    • RAID 0
    • Included Drive Guide software will format the drive for either OS X or Windows


    • Power Supply
      • External UL-listed universal auto-switching
      • AC input: 100 ~ 240V, 50/60Hz
      • DC output:, 12V @ 3A
      • 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° — 185°
      • Temperature (°C) &min;40° — 85°


    • Height: 28 mm (1.1 in)
    • Width: 155 mm (6.1 in)
    • Length: 144 mm (5.7 in

    Weight (without drives)

    • 0.6 kg (1.25 lbs.)
    1. Booting in RAID 0, RAID 1, and SPAN mode are supported without limitation.

    2. The following limitations apply when booting in Independent mode: only the disk connected to Port 2 is bootable when both drives are installed. If only one drive is installed, the disk will boot regardless of which port it is connected to. Please check the Assembly Manual & User Guide for more details.

    3. If connecting from a computer with USB 3.1 Gen 1 via Standard-A to USB-C adapter cable, the device will function at USB 3.1 Gen 1 speeds. Currently the Mercury Elite Pro Dual mini is not compatible with the USB-C port on the OWC USB-C Dock. Please connect to one of the USB Standard-A ports instead. Performance is identical on all USB ports on the USB-C Dock.
    Manufacturer provided specifications for Other World Computing p/n MEMDC2SSD0.5 UPC#: 812437023930



    1. May be required for certain older (pre-2012 Macs and various PCs) USB 2.0/3.0 Type A models which may not provide the necessary power via bus.


    Prosoft Macworld 4.5 miceProsoft
    Prosoft Engineering® Data Backup 3 for OS X v10.2.8 or later
    Backup Made Easy. Data Backup makes it easy to backup to FireWire and USB drives, network drives, CDs and even DVDs. Make schedules so you don't need to 'think' about backing up... It does it for you.
    A $59.00 Value! View detailed software info, or click here to purchase softwareseparately from solution
    NovaStor NovaBACKUP® Solution for Windows®
    NovaBACKUP has been helping millions of users recover from data loss and disasters for over 18 years. Feature rich, NovaBACKUP provides a powerful backup solution. Built-in support for hundreds of the most popular storage devices and a step-by-step backup and restore wizard makes NovaBACKUP extremely easy to use. Requires Windows 2000 or later.
    A $49.95 Value! View detailed software info
    Intech SpeedTools Utilities
    Intech® SpeedTools Utilities™
    Intech SpeedTools consists of a suite of utilities managed by an application which controls the launching, documentation and version control of each individual component utility, such as Disk Defrag and QuickBack. An easy-to-use installation and removal application is provided to make installation a snap, yet powerful enough to allow you to customize which utility component set you would like to create.
    An $89.95 Value! View detailed software info, or click here to purchase software separately from solution


    The best warranty is one you never have to use - but should the need occur - we're proud to provide a superior level of support and service coverage to our customers.

    3 Year OWC Solution Limited Warranty
    Complimentary 1 Year Level 1 Data Recovery

    OWC is proud to provide a superior level of support and warranty coverage to our customers. Even when not used, we understand the peace of mind afforded by a longer warranty period. OWC's industry leading coverage is a testament to our confidence in the reliability of the solutions that we offer. OWC solutions are engineered to demanding quality standards in order to deliver the most reliable, highest performance available on the market in each storage category.

    Customer Ratings

    Write a Review 5 / 5 1 out of 1 (100%) reviewers would recommend this product
    Verified Buyer Top 50 Contributor
    Reviewer: joevt Location: Langley, B.C. Age: 35-44 Experience Level: Power User Owned Product: less than a month
    Rating: 5/5 Excellent quality and performance March 8, 2017 I wanted to buy a drive that can perform faster than 5 Gb/sec. This USB 3.1 gen 2 device does just that.

    I've tested this in macOS Sierra. The Apple drivers in Mac OS X El Capitan do not support 10 Gb/sec.

    I've connected this device to a AlpineRidge Thunderbolt 3 controller. No issues there.

    I've connected this to a ASMedia 1142 PCIe card from Startech. Half the time, System Information.app would say the speed was "Up to 480 Mb/sec". When this happened, the drive performed at USB 2.0 speeds. The other times, it says "Up to 5 Gb/sec" but the benchmarks I tried showed that it was doing more than 5 Gb/sec. Windows 10 had similar issues, but would sometimes show the connection as 10 Gb/sec. I tried two different USB-C cables (one was a Thunderbolt 3 cable). This may be an issue with the ASMedia chip in general, my PCIe card specifically, Apple's XHCI driver, or a combination. I only have one PCIe card and this one USB 3.1 Gen 2 device to test.

    I used Black Magic Disk Speed Test.app to test the speed. This will get you some quick ballpark numbers:

    USB 2.0 speed: 41.5 MB/s Write, 41.8 MB/s Read USB 3.0 speed: 411.2 MB/s Write, 428.0 MB/s Read USB 3.1 Asmedia 1142: 710.1 MB/s Write, 784.3 MB/s Read USB 3.1 AlpineRidge: 756.3 MB/s Write, 836.5 MB/s Read

    Those numbers were from a Skylake PC (4.6 GHz). The USB 3.1 speed was slightly slower in a Mac Pro 2008 using the Asmedia 1142 PCIe card: 660.3 MB/s Write, 740.5 MB/s.

    For the SSD's, I used two 1.0TB Mercury Extreme Pro 6G.

    I would recommend this item to a friend! This review is from OWC Mercury Elite Pro Dual mini bus-powered USB 3.1 Gen 2 RAID Storage Enclosure. Customer Videos:

    Verified Buyer Top 250 Contributor
    Reviewer: shortimer Location: Ellington, Connecticut Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
    Rating: 5/5 RAID done right (USB-C) February 1, 2017 Another well designed product from OWC. Returned two tries with a LaCie Rugged RAID 4TB, which is TB2. This USB-C product from OWC just works. The price AND speed w/ RAID is the best per gigabyte compromise available at this moment. Obviously, this is in conjunction w/ the new MBpro design that only has USB-C ports. Highly recommended, because there just aren't many/any choices out there for bus powered 220mbps speed @ 4TB of memory.

    I would recommend this item to a friend! This review is from 4.0TB OWC Mercury Elite Pro Dual mini Portable, Performance USB C RAID Solution. Customer Videos:

    OWC Mercury Elite Pro Dual mini 480GB Bus-Powered Storage Solution Mfr P/N: MEMDC2SSD0.5 MacSales.com SKU: OWCMEMDC2SSD0.5 Dual bay USB 3.1 Gen 2 equipped bus-powered RAID solution 3 Year OWC Limited Warranty Ships: Same Day only $379.99
    Add to CartOther World Computing MEMDC2SSD0.5 In Stock, Click to Buy Now
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