OWC ThunderBay 4 mini Thunderbolt 3 - with 4 x 2.5-inch HDD/SSD Bays External Storage Enclosure

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£338.00 - £393.49 (Inc. VAT)
£281.67 - £327.91 (Ex. VAT)
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OWC ThunderBay 4 mini RAID Four 2.5-inch Bays External Thunderbolt 3 Storage Enclosure

Drives not included. Add your own drives! Thunderbolt cable included. Available with or without  SoftRAID software. Just choose your option.

The Perfect Combination of Speed, Size, and Convenience for Permanent Access to Your Data


  • Four 2.5-inch drive bays
  • Up to 1556MB/s with (2) Thunderbolt 3 ports (Thunderbolt 2/Thunderbolt backward compatible)
  • Daisy-chain up to five additional Thunderbolt devices
  • Includes SoftRAID: robust software for creating, monitoring, and managing advanced RAID sets
  • Thunderbolt certified for Mac and Windows

Big RAID System Performance in a Compact Design
The ThunderBay 4 mini hard drive equipped solution is big on performance and flexibility yet sized about the length of a pencil. The rugged heat-dissipating aluminum enclosure features two Thunderbolt 3 (Thunderbolt 2/Thunderbolt backward compatible) ports for up to 1556MB/s real-world speeds, so you have more than enough bandwidth to handle personal and business backups — all the way up to today's highest resolution audio, photo, and video formats. If you are seeking big RAID performance that's small enough to fit on a desk, in a rack, or on a DIT cart, your wish is now a reality.

A New World of Drive Flexibility
With four hard drive populated bays, you can use the drives independently or combine drives as a RAID with the included SoftRAID setup and management software. The ThunderBay 4 mini is also perfect for repurposing or maximizing bare 2.5-inch HDDs and SSDs you already own
Expand production capabilities in industry-leading creative platforms like Final Cut X, Avid Pro Tools, Apple Pro Logic, and Adobe Lightroom, edit large images, manage massive photo and audio libraries, store drone videos, use it as a transport drive…whatever the day or project demands, the ThunderBay 4 mini is the perfect workflow solution.

Install or Swap in Minutes
Want to access another drive or expand your storage capacity? Simply open the front panel security lock to access the four individual bays. Drives mount to a tray that slides back in and automatically plugs into a drive connector so you can get back to work in minutes.

Store More, Go Faster
With the ability to daisy-chain you can add up to five additional ThunderBay 4 mini solutions to create massive storage capacities. Merge them with SoftRAID for even more flexibility, capacity, and capability. Or if speed is what you’re after, connect multiple ThunderBay 4 mini solutions to multiple Thunderbolt 3 ports on your Mac or PC to achieve exponential speed capabilities.

Professional Grade = Ready to Work
We understand having confidence in gear reliability is paramount to creative professionals. That’s why every ThunderBay 4 mini enclosure undergoes a multi-step performance certification prior to shipping. This ensures your ThunderBay 4 mini enclosure arrives ready for demanding use.

More Powerful With SoftRAID
Need more power and protection? Choose a solution that includes OWC's powerful SoftRAID RAID software.
SoftRAID is the most powerful, intuitive software RAID utility on the market. Multiple RAID levels let you select the RAID level that fits you or your project’s needs best. If you need maximum volume capacity, optimum drive performance, data protection, or a combination of attributes, SoftRAID has you covered.
Packed with features like drive validation, verification and failure prediction—SoftRAID includes features you simply don’t get with hardware RAID. It’s like having a datacenter on your desktop! From home users looking to protect photos and documents to professionals needing to protect and quickly access projects, SoftRAID is the perfect solution. Learn more about the power of SoftRAID XT.

Start protecting yourself and your data today! Get all of SoftRAID's great disk checking and monitoring features, plus the fastest and most efficient software RAID there is. Download and try SoftRAID for FREE.

Secure Your Workflow with OWC ClingOn
Greatly reduce — if not eliminate — cable strain and accidental disconnects with the OWC ClingOn. These custom cable stabilizers (sold separately) screw into the ThunderBay 8's housing to secure your Thunderbolt 3 and USB-C connections and prevent work session interruption and possible data loss.

Support You Can Trust
Like all OWC products, the ThunderBay 4 mini enclosure is fully backed by OWC's award-winning support team and OWC Limited Warranty.

(1) OWC ThunderBay 4 mini
(1) 0.7M OWC Thunderbolt Cable
(1) External Power Supply and Power Cord
(2) Security Keys for Front Panel Lock
(1) Quick Start Guide
1 Year OWC Limited Warranty

Mechanisms Supported Four (4) 2.5-inch SATA drives
Boot Support Independent volumes bootable in macOS
Chipset Thunderbolt: Intel JHL6540
SATA Controller: ASMedia ASM-1062
Drive Interface SATA
Certifications CE
Data Transfer Rate (Maximum) Thunderbolt 3 : Up to 40 Gb/s (or 5000 MB/s)
Reach Certification Yes
RAID Capable Yes
RAID Levels Supported JBOD
RAID Features Software RAID
Mac OS Compatibility macOS 10.13 High Sierra
macOS 10.14 Mojave
macOS 10.15 Catalina
macOS 11.x Big Sur
macOS 12.x Monterey
PC OS Compatibility Windows 10 64-bit Edition
Windows 11
Other Requirements SoftRAID XT works with macOS 10.12 or later and Windows 10 or later. SoftRAID is licensed per computer. The SoftRAID serial number will work with both Mac and Windows but can only be active on one computer at a time. Additional seats can be purchased. RAID 4/1+0 (10) are currently Mac only at this time.
Host Port Requirements Thunderbolt (USB-C) Port
Driver Required No
Power Supply External UL-listed universal auto-switching power supply
Need an additional power supply? Secondary/replacement power supplies are also available. Contact us if you need one and quote part OWCPWR12V6A
AC Input 100-240V, 50-60Hz, 2.0A
DC Output +12V, 6A
Wattage 72W
External Power Adapter Yes
Number of Bays 4
Device Ports (2) Thunderbolt 3 (USB-C) Ports
Cooling (1) 60mm cooling fan
Security Slot Yes
Power/Activity LED Yes
Housing Color Black
Housing Material Aluminum
Dimensions Height: 11.7 cm (4.6 in)
Length: 19.1 cm (7.5 in)
Width: 9.6 cm (3.8 in)
Weight 1.1 kg (2.51 lbs)
Ambient Temperature Operating: 41°F to 95°F (5°C to 35°C)
Non-Operating: -4°F to 140°F (-20°C to 60°C)
Altitude Operating: -304.8 m to 3,048.0 m (-1,000 ft to 10,000 ft)
Non-Operating: -304.8 m to 12,192.0 m (-1,000 ft to 40,000 ft)
Humidity Operating: 8% to 90% non-condensing
Non-Operating: 5% to 95% non-condensing
Noise Varies depending on drive mechanism installed
Manufacturer part numbers

OWCTB3QMJB000 - without SoftRaid software

OWCTB3QMSR00GB - with SoftRaid software

1 Year OWC Limited Warranty


Host Port Requirements
Thunderbolt (USB-C) Port


  • 5

    OWC Thunderbay 4 - Mini

    Posted by Stu on 6th Jan 2023

    Great product, a little noise from the fan but not too obtrusive, I have disconnected the fan as using SSD's and is for light work only. Highly recommend to anyone who requires large storage space with lightening fast transfer speeds.