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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 370MB/s read / 414MB/s write sustained RAID 5 performance
  • Up to 473MB/s read / 579MB/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

    500GB HGST Travelstar™ Z7K500 Specifications:


    Form Factor
    2.5″ HDD
    SATA 6.0Gb/s
    Formatted Capacity2
    Rotational Speed
    7,200 RPM
    Cache / Data Buffer
    Manufacturer Model Number


    Height (max)
    7mm (0.275″)
    Width (max)
    69.85mm (2.750″)
    Length (max)
    100.35mm (3.951″)
    Weight (typical)
    95g (0.209 lbs.)
    Bytes per Sector
    Areal Density


    Contact Start-Stops
    3 Year HGST Warranty


    Transfer Rate (Max)
    Track-to-track Seek
    Average Seek Time
    Average Latency


    Maximum Start Current, DC
    5.5 Watts
    Seek Power
    2.1 Watts
    Read Power
    1.8 Watts
    Write Power
    1.8 Watts
    Idle Mode
    1.7 Watts
    Idle Mode, Active
    1.0 Watts
    Idle Mode, Low Power
    0.8 Watts
    Standby Mode
    0.2 Watts
    Sleep Mode
    0.1 Watts

    Environmental (Operating)

    400 G max at 2ms
    Ambient Temperature (°F)
    32°F to 140°F
    Ambient Temperature (°C)
    0°C to 60°C
    -304.8 m to 3,048 m (-1,000 ft to 10,000+ ft)

    Environmental (Non-Operating)

    1000 G max at 1ms
    Ambient Temperature (°F)
    -40°F to 149°F
    Ambient Temperature (°C)
    -40°C to 65°C
    -304.8 m to 12,192 m (-1000 ft to 40,000+ ft)


    Idle (Typical)
    2.3 bels
    Seek (Typical)
    2.4 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 rates.
    • 4 x 500GB* HGST Travelstar Z7K500 Hard Disk 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.

    Drive Rotation Speed

    • 7200 RPM

    Drive Cache Size

    • 32MB per drive, 128MB total for the solution

    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 TB4MSRH02T7 UPC#: 812437021011


    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


    OWC 2.0TB ThunderBay 4 mini - RAID 5 Edition Mfr P/N: TB4MSRH02T7 MacSales.com SKU: OWCTB4MSRH02T7 High-Performance 4-bay External Drive 3 Year OWC Solution Limited Warranty Ships: Same Day Only $719.99MacSales.com Price $679.99
    Add to CartOther World Computing TB4MSRH02T7 In Stock, Click to Buy Now
    Need Windows Access to SoftRAID volumes?