LaCie 12big Thunderbolt 3 Guide Demarrage Rapide page 3

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USB connection
1
Connect your LaCie storage device's USB 3.1 port to your computer's USB-C port or
USB Type A port. You can also connect the cable to a Thunderbolt 3 port on your computer.
However, do not use the Thunderbolt 3 ports on the LaCie storage until you have completed
all the steps.
USB-C/USB-C
USB-C/USB-A
2