Quality Solutions. Expert Support. Since 1988.

MacSales.com Logo

OWC ThunderBay 4 mini
RAID 5 Edition

2.0TB 4-bay external drive

Dual Thunderbolt 2 | RAID 5 | 4 Drive Bays | Mac
Performance + Redundancy
Experience the first and only software RAID 5 technology developed for the Mac with the ThunderBay 4 mini RAID 5 Edition. Optimized for 2.5" drives and perfect for SSDs, ThunderBay 4 mini RAID 5 Edition delivers outstanding performance and reliability for the most demanding applications, including workflows involving 4K, 2K, uncompressed HD, and multi-stream SD video.
  • Up to 1004MB/s read / 896MB/s write sustained RAID 5 performance
  • Up to 1332MB/s read / 1290MB/s write sustained RAID 0 performance
  • Preconfigured in RAID 5 for optimal data redundancy
  • 75% faster rebuild times than hardware RAID

  • Do more with a ThunderBay enhanced workflow.
    Expand production capabilities for industry-leading creative platforms like Final Cut X, Avid Pro Tools, and Adobe Lightroom with this incredibly fast and portable 4-bay storage solution. ThunderBay 4 mini RAID 5 Edition is preconfigured in RAID 5 and supports RAID 0, 1, 4, and 1+0 arrays to achieve the optimal balance of storage, performance, and data-redundancy your workflow demands.
    The RAID 5 Advantage
    With RAID 5, the four drives inside ThunderBay 4 mini are merged for increased capacity and tremendous performance gains over a single drive. Special redundancy data, called "parity information," is also stored across the drives, allowing your data to remain completely safe so you can maintain your mission critical workflows worry-free.
    Thinking Outside the Enclosure
    OWC unlocks the incredible performance and flexibility of ThunderBay by pairing the drives with a robust software RAID solution. Powered by the SoftRAID engine, ThunderBay 4 mini RAID 5 Edition delivers advanced RAID modes, real-time health monitoring with email notifications, and best-in-class rebuild speeds. Unlike traditional software RAID solutions, SoftRAID 5 for ThunderBay's revolutionary volume optimization allows you to quickly configure your drive for specific workflows. Now, you can experience the absolute best performance whether recording audio, editing 4K video, or creating a multimedia server.
    Flexible and Robust
    Take full advantage of the flexibility offered by the ThunderBay 4 mini and SoftRAID engine. Easily build and reconfigure complex RAID arrays, or connect multiple ThunderBays to create even larger RAIDs with up to 16 drives for optimal performance and redundancy. Now, users can enjoy robust RAID options with near enterprise-grade storage and performance for a fraction of the cost.
    Certified and tested.
    Each ThunderBay undergoes OWC's regimented multi-hour drive "burn-in" to ensure you experience the amazing performance of your drive right out the box.

    4 drive bays plus so much more.
    Time-tested Cooling Cool + Whisper Quiet
    A durable, heat-dissipating, aluminum unibody shell features a "flow-thru" vented design coupled with a 60 mm whisper-quiet fan.
    DisplayPort 1.2 4K Display Support
    Dual Thunderbolt 2 ports let you connect any display that your computer can support, including 4K displays.
    Vibration Dampened Vibration Dampened
    ThunderBay's drive isolating design reduces sonic resonance, and is aided by rugged, vibration-absorbing, non-skid feet.
    Multi-Drive Flexible Expansion
    Daisy-chain up to six ThunderBays on a single Thunderbolt port for expansive storage, RAID, and performance options.
    Thunderbolt Cable OWC Thunderbolt Cable
    ThunderBay comes with an OWC one-meter certified Thunderbolt cable, with other lengths from 0.5 meter to 30 meters available separately.


    • OWC ThunderBay 4 mini High-performance 4-bay Thunderbolt 2 interface drive
    • SoftRAID 5 for ThunderBay
    • High-Quality, Certified, Double-Shielded 1-Meter Thunderbolt cable
    • External UL listed 3-prong power cable
    • 2 keys for front panel lock
    • ThunderBay 4 mini Quick Start Guide
    • OWC ThunderBay 4 mini Assembly Manual & User Guide (Download Only)
    • SoftRAID for ThunderBay Quick Start Guide (1.3 MB)
    • Utility software bundle for Mac
    • OWC 3-Year Solution Limited Warranty with 48-Hour Turnaround Time
    • Complimentary 1-Year, Level-1 Data Recovery


    Product Specifications


    • Thunderbolt 2

    Interfaces Supported

    • Thunderbolt 2

    JBOD / RAID Support

    • JBOD: Utilize each of the four drives independently
    • RAID: Use the included software RAID or one of your choice to setup the ThunderBay 4 for multi-drive performance or data redundancy.
    • SoftRAID 5 Support Page

    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.

    480GB Mercury Extreme Pro 6G SSD Specifications:


    Silicon Motion SM2246EN Series with 7% Over Provisioning firmware set
    Tier 1 3D NAND
    Form Factor
    Standard 7mm 2.5"
    SATA 6Gb/s, 3Gb/s & 1.5Gb/s supported, SATA 3.0 Compliant
    480GB useable capacity
    Total Flash Memory Components – 512GB
    32GB 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
    Built-in BCH ECC: Up to 66 bits correctable per 1024 bytes
    Chip Based Data Encryption: 256-bit AES-compliant
    TRIM Support
    OS Dependent
    Nonrecoverable Read Errors
    Less than 1 sector per 1016 bits read


    Sequential Reads (6Gb/s, Compressible Data)
    535 MB/s
    Sequential Writes (6GB/s, Compressible Data)
    435 MB/s
    Sequential Reads (6GB/s, Incompressible Data)
    520 MB/s
    Sequential Writes (6Gb/s, Incompressible Data)
    431 MB/s


    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.
    • 4 x 480GB* 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.

    Port Configuration

    • Thunderbolt – (2) Thunderbolt 2 ports


    • Comes pre-formatted for SoftRAID and configured as a RAID 5 volume.*
    • *If utilizing on a Mac with OS X 10.8.5 or earlier, the SoftRAID software must be installed prior.

    Max Data Transfer Rate

    • Thunderbolt 2 – 20Gb/sec

    Port/Interface Bootability

    • It can be used as a Thunderbolt startup drive on Macs running Mac OS X.

    System Requirements

    • Any Mac with a Thunderbolt port running OS X 10.9 or later.
    • Boot Camp is not supported. The Thunderbolt certification process does not include Macs running Windows through Boot Camp.

    Software Included

    Power Supply

    • UL Listed U.S./International Auto Switching 100 ~ 240v, 50/60Hz input, 12 Volt 6.0 Amp output Power Supply (power cords for International use sold separately).

    External Case Dimensions

    • 7.6"(D) x 3.8"(W) x 4.6"(H)
    • 19.3cm x 9.6cm x 11.6cm

    Enclosure Weight (no accessories)

    • Approximately 2.4 pounds (1.1kg)

    Product Manual

    Operating Environment:


    • (operating) 5°C – 42°C (41°F – 107°F)
    • (non-operating) -40°C – 65°C (-40°F – 149°F)

    Relative Humidity

    • (operating) 8% – 90% RH (Non-condensing)
    • (non-operating) 5% – 95% RH (Non-condensing)


    • 65G 2mS; (non-operating) 175G 2mS


    • (operating) 1.0G (5 – 300Hz)
    • (non-operating) 5.0G (5 – 500Hz)


    Includes OWC's award-winning U.S. based support for both the ThunderBay 4 drive and SoftRAID software.


    3 Year OWC Solution Limited Warranty

    The best warranty is one you never have to use, but should the need occur – 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.

    View more information about the 3 Year OWC Solution Limited Warranty

    Note: Do not disassemble or otherwise open your OWC solution prior to the conclusion of the 3 Year OWC Solution Limited Warranty period. Doing so will void the remainder of the OWC warranty.

    Manufacturer provided specifications for Other World Computing p/n TB4MSRSSD02T UPC#: 812437021059


    SoftRAID 5 for ThunderBay
    OWC has partnered with SoftRAID to bring software RAID 5 to the Mac. SoftRAID combines advanced RAID modes, fast performance, monitoring, e-mail notification, and fast rebuild capabilities that only software RAID can deliver. ThunderBay 4 models with drives come preconfigured in RAID 5, and are plug and play ready with OS X 10.9 or later. Advanced features such as drive notification and monitoring require SoftRAID installation.

    Prosoft Macworld 4.5 miceMacworld
    Prosoft Engineering® Data Backup 3 for Mac 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 software separately from solution
    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


    Customer Ratings

    Write a Review 4 / 5 1 out of 1 (100%) reviewers would recommend this product
    Verified Buyer
    Reviewer: Anonymous Location: Tokyo, JP Age: 35-44 Experience Level: IT Professional Owned Product: less than a month
    Rating: 4/5 Good performance for the price. October 10, 2015 I like the ThunderBay 4 Mini SSD RAID box. It is a lot of storage in a small package. The software made it really easy to setup everything. I was able to easily chain in a monitor in TDM. The major benefit with the mini is the power unit is external and that heat is not in the enclosure and it is all very small. The fan is not as "whisper-quiet" as advertised, but it is fairly quiet. If one of your reasons for using SSDs is to avoid noise, the fan might bother you. The overall benefit of the RAID enclosure far outweighs the small noise issues.

    Write speeds for four drives in RAID 10 (1+0) were slightly faster than two original Mac SM256E SSDs in RAID 1. Read speeds were about the same with double the drives, but it is still fast enough for my needs so no real complaint about it.

    I would recommend this item to a friend!

    OWC 2.0TB ThunderBay 4 mini - RAID 5 Edition Mfr P/N: TB4MSRSSD02T MacSales.com SKU: OWCTB4MSRSSD02T High-Performance 4-bay External Drive 3 Year OWC Solution Limited Warranty Ships: Same Day Only $1,449.99MacSales.com Price $1,399.99
    Add to CartOther World Computing TB4MSRSSD02T In Stock, Click to Buy Now
    Need Windows Access to SoftRAID volumes?