Get the LaCie 2big Dock with Thunderbolt 3 connectivity here: https://www.sweetwater.com/store/detail/2bigDock-8
Mac, PC, Thunderbolt 2, USB 2 — it doesn't matter — your d2 Thunderbolt 3 is totally compatible. The IronWolf Pro HDD in the d2 Thunderbolt 3 takes Seagate's reputation for reliability and performance even further, topping the industry spec charts with drives up to 20TB and consistent 7,200 rpm speeds. It even comes complete with a USB-C to USB-A adapter cable.