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OWC ThunderBay 4
RAID 5 Edition

64.0TB 4-bay external drive

Dual Thunderbolt 2 | RAID 5 | 4 Drive Bays | Mac
Performance + Redundancy
  • Fits both 2.5" and 3.5" drives
  • User configurable in RAID 0, 1, 4, 5 & 1+0
  • Up to 651MB/s read / 446MB/s write RAID 5 performance 1
  • Exponentially faster rebuild times than hardware RAID
Experience the first and only software RAID 5 technology developed for the Mac with the SoftRAID XT. Empower your workflow with up to 35% faster RAID 5 performance and exponentially faster rebuild times than comparable hardware based RAID arrays. Activate advanced features, such as drive monitoring, e-mail notifications, and more when you install the included SoftRAID XT for macOS.

Conventional wisdom turned on its head.
Hardware RAID has long been thought to be superior to software RAID, but we've now combined the massive performance and capacity of ThunderBay 4 with a robust, proven software RAID engine to provide breathtaking performance, flexibility, and reliability.
Software RAID + ThunderBay = WHOA!
Over a year ago, OWC partnered with SoftRAID to bring enhanced storage capabilities to the Mac, and we're now seeing that dream become a reality. SoftRAID XT combines advanced RAID modes, fast performance, monitoring, e-mail notification, and fast rebuild capabilities that only software RAID can deliver.
Monitoring + Notifications
SoftRAID XT lets you easily setup drive monitoring and e-mail notifications to keep you informed about your ThunderBay's performance and drive health. Helping you to maintain mission critical workflows.
Better than Hardware RAID Performance
ThunderBay 4 and the SoftRAID engine offers faster performance than many competing 4 or even 5-bay hardware RAID external drives – benefiting from modern processors that are both fast and designed for exceptionally high-performance RAID management with no real-world impact on apps or tasks.
Flexible + Robust
SoftRAID XT is extremely flexible and can easily be updated, reconfigured and used across multiple enclosures to provide an amazing amount of robust options to empower you to make the most of your ThunderBay workflow.
Backed by OWC
Should you ever have a question or troubleshooting need, you can rely on OWC's award-winning U.S. based support for both the ThunderBay 4 drive and SoftRAID XT software.

Empower your workflow with RAID 5 performance and up to 40TB capacity.
Edit, view, stream, and produce more with ThunderBay in your 2K, 4K, and audio production workflow.
The RAID 5 Advantage
RAID 5 merges the four drives inside ThunderBay together for exponential performance gains over a single drive, the combined capacity of three of the drives, and data redundancy that allows the array to still work even if one drive were to fail!
Edit, Experiment, Create, Design
With ThunderBay's performance capabilities you can complete projects faster, have more time to experiment, and push your creations to the next level.

Enhance editing capabilities in video apps like Apple Final Cut Pro, Adobe Premiere, and Avid Media Composer. Empower greater audio production capabilities in audio apps like Avid Pro Tools and Logic Pro X. Edit large photos in apps like Adobe Photoshop, and browse large photo libraries in apps like Apple Aperture and Adobe Lightroom. Simply put, you can do more with a ThunderBay 4 enhanced workflow, and with a RAID 5 array you get data redundancy on top of great performance!
Certified and Tested
Each ThunderBay undergoes OWC's multi-hour drive "burn-in" performance certification procedure prior to shipping. This ensures your ThunderBay arrives operating properly and ready for demanding use.

4 drive bays plus so much more.
Time-tested Cooling Time-Tested Cooling
Built on OWC's time-tested enclosure cooling technology, ThunderBay utilizes an open "flow-thru" vented design with an oversized 92 mm, low-turbulence, noise-quieting fan to keep the drives running cool and reliably.
Multi-Drive Multi-Drive
Daisy-chain up to six ThunderBays for massive storage capabilities and increased performance, or connect multiple ThunderBays to multiple Thunderbolt 2 ports to achieve exponential speed capabilities.
Vibration Dampened Vibration Dampened
ThunderBay's drive isolating design reduces sonic resonance, and is aided by over-sized, rugged, vibration-absorbing, non-skid feet.
DisplayPort 1.2 DisplayPort 1.2 Support
Dual Thunderbolt ports let you connect the display of your choice that your computer can support, including 4K displays.
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.
1. Read and write speeds of sequential, incompressible data.



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

  • 16.0TB Seagate Exos X16 Enterprise Hard Disk Drive Specifications:


    Form Factor
    3.5″ HDD
    SATA 6Gb/s
    16.0 TB
    Formatted Capacity
    14901 GiB
    Rotational Speed
    7200 RPM
    Cache / Data Buffer
    Manufacturer Model Number


    Height (max)
    2.6 cm (1.0 in)
    Width (max)
    10.2 cm (4.0 in)
    Length (max)
    14.7 cm (5.8 in)
    Weight (typical)
    670.0 g (1.48 lbs)
    Data Heads
    Number of Disks
    Guaranteed Sectors
    Bytes per Sector
    512 / 4k (512e)
    Areal Density


    MTBF (Mean Time Between Failures)
    2,500,000 hours
    Contact Start-Stops
    Annual Failure Rate
    Nonrecoverable Read Errors
    1 per 1015 bits read


    Random 4K Read
    Up to 170 IOPS
    Random 4K Write
    Up to 440 IOPS
    Average Seek Time
    Average Latency


    Maximum Start Current, DC
    2.6 Amp
    Idle Mode, Active(Max)
    Up to 5.0 Watts

    Environmental (Operating)

    Ambient Temperature (°F)
    32°F to 140°F
    Ambient Temperature (°C)
    0°C to 60°C
    50 G max at 2 ms
    Relative Humidity (non-condensing)
    8% to 90%
    -1,000 feet to 10,000 feet

    Environmental (Non-Operating)

    200 G max at 2 ms
    Relative Humidity (non-condensing)
    5% to 95%
    -1,000 feet to 40,000 feet


    Idle (Typical)
    2.8 bels
    Seek (Typical)
    3.2 bels
    • 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.
    • 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.
    • Specific application environments such as temperature and duty cycle will affect the overall reliability rates.
    4 x 16.0TB* Seagate Enterprise Capacity 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

  • 256MB per drive, 1024MB 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

  • SoftRAID XT

Power Supply

  • Internal UL Listed U.S./International Auto Switching 100 ~ 240v, 50/60Hz input, 12 Volt 16.66 Amp output Power Supply (power cords for International use sold separately).

External Case Dimensions

  • 9.65″(D) x 5.31″(W) x 6.96″(H)
  • 245.11mm x 134.87mm x 176.78mm

Enclosure Weight (no accessories)

  • Approximately 8.6 pounds (3.9kg)

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 TB2SRT64.0S


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.


OWC 64.0TB ThunderBay 4 - RAID 5 Edition Mfr P/N: TB2SRT64.0S OWC SKU: OWCTB2SRT64.0S High-Performance 4-bay External Drive 3 Year OWC Limited Warranty Ships: 4 Days only $2,779.99
Add to CartOther World Computing TB2SRT64.0S, Click to Buy Now
Additional Capacities & Kits: Add Your Own Drives
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  • 64.0TB
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