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Home/All Brands/OWC/OWC 4TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution
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OWC 4TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution
OWC 4TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution
OWC 4TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution

OWC 4TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution

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Product Information


Your Multitool for Digital Workflows

With dual drive bays, and seven connectivity ports including an SD 4.0 card reader, the OWC Gemini is the do-it-all tool that will organise your digital life. You’ll have plenty of room to duplicate footage, create and manage archives, or render and process effects. Connect your favourite peripherals via USB ports. Ingest the day’s shoot or drone footage with the frontside reader.

Hardware RAID: Speed, Reliability, Flexibility

The Gemini utilises hardware RAID to unleash the full potential of two 3.5" 7200RPM hard drives. Preconfigured in high-speed RAID 0 mode to deliver maximum sustained throughput from its drives, the Gemini offers real-world speeds up to 497MB/s to handle HD video workflows. If you desire the extra security of mirrored data, you can configure the Gemini in RAID 1 mode. Need more drive flexibility? Set up a span to combine the capacity of the two drives into one huge volume or use the drives as independent volumes.

Future Project Ready

You can customise the Gemini to quickly adapt to project changes and help you stay ahead of deadlines. With built-in hardware RAID, you have four drive set-up choices:

  • Non-RAID to keep the drives as independent volumes
  • RAID 1 (mirror) for backup reliability
  • RAID 0 (stripe) for optimal performance and maximum speed or use
  • Span to combine the drive capacities into one huge volume for extra-large storage capacities

Done with the drives but need the connectivity? Just eject the RAID from your computer and the Gemini keeps you working smoothly.

Full Stream Ahead

The Gemini features a 1Gb Ethernet port to keep you connected at speeds that leave WiFi in the dust. A must-have for shared workflows and workspaces, Ethernet connectivity speeds up file transfers giving you an edge on your work in progress.

Professional Grade = Ready to Work

OWC understand having confidence in gear reliability is paramount to creative professionals. That’s why every Gemini configured solution undergoes OWC's multi-hour drive "burn-in" performance certification procedure prior to shipping. This ensures it arrives operating properly and immediately ready for demanding use.

Disconnect in One Click

OWC Dock Ejector software safely disconnects drives in a single click. Designed by OWC hardware and software engineers, Dock Ejector ensures all data is written before disconnection, saving time and protecting against data loss. Use it to move quickly between workstations and get the most out of your OWC Dock.

  • Performance storage: up to 497MB/s
  • Fast connectivity: (2) Thunderbolt 3 ports
  • Speed and storage: hardware RAID controller (RAID 0,1, Span or JBOD/Independent)
  • Easy camera uploads: frontside SD 4.0 (UHS-II) card reader
  • A hub of options: (2) USB 3.1 Gen 1 (Type-A) ports
  • Full steam ahead: 1Gb Ethernet port
  • See work in progress: DisplayPort 1.2 for adding up to a 4K monitor
  • Custom configurations: (2) bays for 2.5-inch or 3.5-inch SATA drives


Standard Mechanism
2 x 2TB HDDs
Number of Bays
(2) 2.5" or 3.5" SATA drives
Mac OS Compatibility
macOS 10.14 Mojave and later
PC Compatibility
Windows Server 2016 / Windows 10 64-bit Edition
Other Requirements
Computer with Thunderbolt 3 port
CE, FCC, VCCI, BSMI, RCM, Thunderbolt
RoHS Compliant
  • (2) Thunderbolt 3 Ports
  • (2) USB 3.1 Gen 1 Type A Ports
  • (1) DisplayPort 1.2 Port
  • (1) Gigabit Ethernet (GbE) RJ-45 Port
Memory Card Slots
(1) Secure Digital (SD)
  • Thunderbolt (2): Intel JHL6540
  • Media Reader: Genesis Logic GL-3227
  • USB (2): Fresco Logic FL1100EX
  • Ethernet (1): Intel i210
  • SATA Controller: ASMedia AS
RAID Modes Supported
JBOD, RAID 0 striping, RAID 1 mirroring & SPAN
Default Raid Level
Housing Material
High quality aluminium for optimised heat dissipation
(1) Cooling fan
Data Transfer Rate (Max)
  • Thunderbolt 3: 40 Gb/s (or 5000 MB/s)
  • Gigabit Ethernet : 1.0 Gb/s
  • USB 3.1 gen 1 : 5.0 Gb/s (or 625 MB/s)
H: 147 mm x L: 238 mm x W: 85 mm

What's in the box

  • 1 x OWC Gemini
  • 1 x Thunderbolt 3 cable
  • 1 x External power supply and power cable
  • 1 x Quick Start Guide
  • 1 x OWC Dock Ejector for Mac and Windows (software download)

Manufacturer Information

Part Number



  • 3 Year Limited Warranty

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