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OWC ThunderBay 4 Four-Bay Thunderbolt External Storage Enclosure for 2.5-inch and 3.5-inch SATA Drives

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The “Just Right” RAID for All Storage Needs

When two bays clearly aren’t enough storage for your needs and eight bays feels a bit ambitious for now, enter the ThunderBay 4. This “just right” Goldilocks of storage solutions offers the space, speed, and flexibility you can use for both current and future needs.
There’s a reason ThunderBay 4 is our most popular multi-bay RAID storage solution. You can use a variety of 3.5-inch or 2.5-inch drives for everyday digital file storage and backup all the way to running multi-stream compressed 4K video. With two Thunderbolt ports, it gives you the muscle to move all that content.
And ThunderBay 4 is highly configurable to perfectly match your storage needs. You can use each drive independently, or with OWC SoftRAID XT (sold separately) configure your setup with the optimal balance of performance and data-redundancy. Get the most out of your storage, take the brakes off your workflow, and do more with a ThunderBay 4.

Cool. Fast. Empowering.

Each populated ThunderBay 4 solution undergoes OWC’s multi-hour drive “burn-in” performance certification procedure prior to shipping. This ensures your ThunderBay 4 arrives operating properly and ready for demanding use.

Time-Tested Cooling

Built on OWC’s time-tested enclosure cooling technology, ThunderBay 4 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.

Vibration Dampened

ThunderBay 4s’ drive isolating design reduces sonic resonance, and is aided by over-sized, rugged, vibration-absorbing, non-skid feet.


Daisy-chain up to six ThunderBay 4s’ for massive storage capabilities and increased performance, or connect multiple ThunderBay 4s’ to multiple Thunderbolt 3 ports to achieve exponential speed capabilities.

Gain a 4K Perspective

With a dedicated DisplayPort 1.2, ThunderBay 4 empowers you to add the fresh, crisp perspective of a 4K display to your workflow. Whether in your home office or on a mobile studio job, seeing your work in full detail is just one connection away. Use it to free up your laptop port so you can dock in and out quick.

The “Supply Chain” That Always Delivers

With two Thunderbolt ports, the ThunderBay 4 lets you daisy-chain up to five additional Thunderbolt devices and displays while keeping Thunderbolt ports on your laptop or desktop free for other uses. You can learn more about how to connect multiple Thunderbolt devices to your computer with this easy-to-flow infographic.

Workflow and Storage Solutions for Pros

Whether you’re finishing and mastering, creating proxies or working with state-of-the-art VFX and AR, you need dependable tech that keeps pace with your demands. OWC workflow and storage solutions cover every angle, delivering blazing speed, capacity for all five levels of RAID, and bonus features like the freedom to daisy-chain and hot-swap.
Use the chart to find the perfect match for your workflow and storage. View chart.

Thunderbolt Made Easy

We make it easy to choose the right gear. Our Thunderbolt Certified products offer the same performance and functionality whether they are Thunderbolt 3 or Thunderbolt 4. And if you’re rocking a beloved Thunderbolt 2 machine, we offer an adapter so you can plug into our universe of award-winning solutions. No hassles, no confusion. That’s the OWC Difference.
  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.


  • (1) OWC ThunderBay 4 External Storage Enclosure
  • (1) 0.7M Thunderbolt Cable
  • (1) US Power Cable
  • (2) Security Keys for Front Panel Lock
  • (1) Quick Start Guide for OWC ThunderBay 4 with Thunderbolt 3
  • (1) Assembly Manual & User Guide for OWC ThunderBay 4 with Thunderbolt 3

    OWC ThunderBay 4 Specs

    Number of Bays 4 x 2.5″/3.5″
    I/O 2 x USB Type-C (Thunderbolt 3 (40 Gb/s))
    1 x DisplayPort (DisplayPort 1.2)
    Compatible Drive Interface SATA (Unspecified Version)
    Form Factor Desktop
    RAID RAID 0, 1, 10, 4, 5, JBOD
    Hot-Swap Support Yes
    Transfer Rates 5000 MB/s
    OS Compatibility Windows 10 or Later
    macOS 10.12 or Later
    *As of February, 2022: Check with manufacturer for the most up-to-date compatibility
    Security Features Kensington Security Slot, Lockable Bay Door
    AC Input Power 100 to 230 VAC, 50 / 60 Hz
    Power Source Internal Power Supply
    Operating Temperature 50 to 95°F / 10 to 35°C
    Operating Humidity 8 to 90%
    Storage Temperature -40 to 149°F / -40 to 65°C
    Storage Humidity 5 to 95%
    Certifications REACH
    *as per Manufacturer
    Status Monitoring LED Indicator
    Cooling 1 x 92 mm Fan
    Material of Construction Aluminum
    Dimensions 9.6 x 7 x 5.3″ / 24.38 x 17.78 x 13.5 cm
    Weight 8.6 lb / 3.9 kg
    Packaging Info
    Package Weight 10.2 lb
    Box Dimensions (LxWxH) 13 x 10.25 x 8.5″
  • 1 Year OWC Limited Warranty
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