LaCie 2big Dock Thunderbolt 3 User Manual
LaCie 2big Dock Thunderbolt 3 User Manual

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Connect your LaCie 2big Dock Thunderbolt 3

Windows and Thunderbolt 3

Your LaCie Thunderbolt 3 storage device is certified for use with Windows PCs that have a Thunderbolt 3 port. However, you may experience connectivity issues between the storage device and the Thunderbolt 3 port on a Windows PC. Therefore, before setting up your LaCie Thunderbolt 3 storage device, please visit your PC manufacturer’s website to update your Windows PC to the latest versions of:

  • BIOS
  • Thunderbolt 3 firmware
  • Thunderbolt 3 driver

Also, make certain that your PC has the most recent version of Windows 10. 

For questions regarding your PC, please contact the PC manufacturer. You can also review the following website for additional information: This issue pertains to the Thunderbolt 3 port and does not affect USB ports.

Step 1 - Download and install LaCie RAID Manager

LaCie RAID Manager manages the storage for your LaCie storage device and provides important firmware updates and notifications. Download and install LaCie RAID Manager before connecting the LaCie storage device to your computer. The process automatically installs a driver that allows LaCie RAID Manager to detect the device and manage RAID arrays.

  1. On the computer that will connect to the LaCie storage device, go to

  2. Download LaCie RAID Manager for Mac or Windows.

  3. Launch the Installer.

  4. Follow the on-screen instructions to complete the installation.

Step 2 – Connect LaCie 2big Dock to your computer

Connect your device to your computer using Thunderbolt 3 or USB.

 Important info regarding the ports: The LaCie 2big Dock can be connected to a computer using the USB 3.1 port or the Thunderbolt 3 port. However, do not connect both ports to a single computer at the same time, or connect each port to separate computers.

Thunderbolt 3 connection

Connect the included Thunderbolt 3 cable to:

  1. 2big Dock
  2. PC or Mac

USB 3.1 Gen 1 or 2 connection

PC or Mac with a USB-C port

The Thunderbolt 3 cable can be used to connect the USB 3.1 (USB-C) port on the LaCie 2big Dock to a USB 3.1 (USB-C) port on your computer.

Connect the included Thunderbolt 3 cable to:

  1. 2big Dock. Make certain to use the correct port with the text USB 3.1.
  2. PC or Mac. Connect to a USB-C port with the USB 3.1 Gen 1 or USB 3.1 Gen 2 icon.

Step 3 - Power connection

Only use the power cable provided with your device. Attaching third-party or other LaCie power cables can damage your device.

Connect the included power cable in the order listed below.

  1. 2big Dock power input.
  2. A live power outlet.

Storage format

Your LaCie device is formatted as HFS+ for Mac. Also, the dual disks are configured for optimal performance using RAID 0. You can change the configuration to RAID 1, which protects data in case one disk fails. Use LaCie RAID Manager to make changes to the RAID.

To learn more about RAID levels and how to use LaCie RAID Manager, see Manage RAID.


When first connecting the device, the disks must be configured and formatted since Windows does not support HFS+. You must use LaCie RAID Manager to delete the current RAID array and create a new one. Once you’ve created the new array, you will need to partition and format it. See Formatting and Partitioning for details.