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Home/All Brands/OWC/OWC 40TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution
OWC 40TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution
OWC 40TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution
OWC 40TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution

OWC 40TB Gemini Thunderbolt 3 Dock & Dual Drive External Storage Solution

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Product Information


OWC Gemini Thunderbolt 3 Dock & Dual Drive

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.

Configure to Your Unique Needs

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 x 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 x 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 x bays for 2.5-inch or 3.5-inch SATA drives


Best External Drive for Photographers

If you’re a photographer, your life is likely overrun by cables, dongles, ports, hard drives, and storage cards. Don’t let your main working drive contribute to that stress. The OWC Gemini has dual drive bays, RAID support, TONS of I/O connectivity, and a lot more that will speed up your workflow and declutter your life—or at least your desk.


Total Capacity
  • 40.0TB
Mechanisms Supported
  • 2.5 inch and 3.5 inch SATA drives
Total Solution Cache Size
  • 1024 MB
Standard Mechanism
  • 2 x 20.0TB Western Digital Ultrastar DC HC560 7,200RPM Enterprise Class Hard Disk Drive with 512 MB cache
Display Support
  • Up to one 5K display @ 60Hz,
  • or one 4K display @ 60Hz
  • or one 4K display @ 30Hz
  • or two 4K displays @ 60Hz
  • or one 4K display @ 60Hz and one 4K display @ 30Hz
Display Support by Port
  • Thunderbolt 3: up to 5K @ 60Hz via a native Thunderbolt 3 display or 4K @ 60Hz via a Thunderbolt display or a USB-C display adapter
Boot Support
  • Mac only
Hot Plug Support
  • Yes
  • 2 x Thunderbolt: Intel JHL6540
  • Media Reader: Genesis Logic GL-3227
  • 2 x USB: Fresco Logic FL1100EX
  • 1 x Ethernet: Intel i210
  • SATA Controller: ASMedia AS
Drive Interface
  • SATA 6.0 Gb/s
  • Unformatted
Rotational Speed
  • 7,200RPM
Data Rate
  • Up to 40 Gb/s
Data Transfer Rate (Maximum)
  • Thunderbolt 3 : up to 40 Gb/s (or 5000 MB/s)
  • Ethernet Speeds (RJ-45)
  • 1Gb/s "Gigabit" (1000BASE-T)
  • 100Mb/s (100BASE-T)
  • 10Mb/s (10BASE-T)
Jumbo Frame Support
  • Yes
RAID Capable
  • Yes
Default RAID Level
  • RAID 0
RAID Levels Supported
  • RAID 0
  • RAID 1
  • SPAN
  • JBOD
RAID Features
  • Hardware RAID
Benchmark Speed, Read (Max)
  • Up to 1020 MB/s
Benchmark Speed, Write (Max)
  • Up to 1067 MB/s
Contact Start Stops
  • 600,000
Mac OS Compatibility
  • macOS 10.12 Sierra
  • macOS 10.13 High Sierra
  • macOS 10.14 Mojave
  • macOS 10.15 Catalina
  • macOS 11.x Big Sur
  • macOS 12.x Monterey
  • macOS 13.x Ventura
PC OS Compatibility
  • Windows 11
  • Windows 10 64-bit Edition
  • Windows Server 2016
Driver Required
  • Windows driver required for 8TB and 10TB models
Host Port Requirements
  • Thunderbolt (USB-C) port (backward compatible with Thunderbolt 2/Thunderbolt 1)
Other Requirements
  • Thunderbolt 2/Thunderbolt compatibility requires a certified Thunderbolt 3 (USB-C) to Thunderbolt 2 (mDP) adapter and a Thunderbolt 2 cable. This configuration provides data transfer at Thunderbolt 2 speeds (up to 20Gb/s) but does not support notebook charging
Power Supply
  • External UL-listed universal auto-switching power supply
AC Input
  • 100-240V, 50-60 Hz, 2.0A
DC Output
  • +12V, 10A
  • 120W
External Power Adapter
  • Yes
Power Delivery
  • Provides up to 27 watts of power via Thunderbolt 3 to charge or reduce laptop and device battery draw
Number of Bays
  • 2
Device Ports
  • 1 x host port - Thunderbolt 3 (USB-C) up to 40 Gb/s (5000 MB/s)
  • 1 x Thunderbolt 3 (USB-C) port
  • 2 x USB 3.2 Gen 1 type-A ports up to 600MB/s
  • 1 x DisplayPort port
  • 1 x Gigabit Ethernet (GbE) RJ-45 port
Memory Card Slots
  • 1 x Secure Digital (SD)
  • 1 x 60 mm 3,000RPM cooling fan
Security Slot
  • Yes
Housing Material
  • High quality aluminium for optimised heat dissipation
  • Aluminium
  • CE, FCC, VCCI, BSMI, RCM, Thunderbolt technology
RoHS Compliant
  • Yes
  • H: 147 x L: 238 x W: 85 mm
  • 1600 g

What's in the box

  • 1 x OWC Gemini Thunderbolt Dock and External Storage Solution
  • 1 x 0.7 m Thunderbolt (USB-C) Cable
  • 1 x External Power Supply and Power Cable
  • 1 x Quick Start Guide
  • 1 x User Guide
  • 1 x OWC Dock Ejector for Mac and Windows (Software Download)
  • 1 x User Guide for OWC Dock Ejector

Manufacturer Information

Part Number



  • 3 Year Limited Warranty

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