Thunderbolt 3 (USB-C) to USB-C adaptor doesn't work on older Macs?
I have acquired a Thunderbolt 3 external disk.
I bought an Apple Thunderbolt 2 cable and Thunderbolt 3 to Thunderbolt 2 adaptor as indicated by LaCie, and connected the disk to my iMac (Late 2015) running Catalina. The disk powers up and then shuts down.
Is this because the adaptor is really only for connecting a new iMac to an old Thunderbolt 2 device? I understood it to work in both directions but my setup does not work. Same problem on a 2015 MacBook.
iMac 27″, macOS 10.15