I have none of these problems when I attach these devices, except for one Envoy Pro EX SSD, via a CalDigit TS3+ Dock. When I try to boot from that SSD the system doesn't see it and hangs. I also have a Samsung T7 SSD with Catalina on it attached to one of the USB-A ports of the Dock. However, if I switch the two Envoy Pro EX SSDs around and have the SSD with Mojave on it in the Thunderbolt 4 port next the Ethernet port, then the system has no problem booting successfully from Mojave on that SSD. When I try to boot from the Thunderbolt 4 attached Envoy Pro EX SSD with Big Sur 11.1 on it, the system crashes and some Chinese characters appear on the screen. Unfortunately I cannot follow this direction as the Envoy Pro EX SSD has a cable permanently attached to it, so it cannot be used withe Apple TB2 to TB3 adapter cable. So indeed Big Sur 11.1 has acknowledged that a second SSD is attached to the Dock.

When I plug a second Envoy Pro EX SSD with Mojave on it into the middle Thunderbolt 4 port, the following message appears in the upper right hand corner of my screen:Ĭonnect accessory to a Thunderbolt port on this Mac.'

Well, I'll try and find out if that's the case, provided Big Sur boots up with the OWC Dock attached.Īttached to the Thunderbolt 4 port, adjacent to the Gigabit Ethernet port, is an Envoy Pro EX SSD with Big Sur 11.1 on it. I should get one live Thunderbolt port that I can boot from and several USB-A ports that I cannot boot from. So that would imply that my old TB2 computer should behave under Big Sur exactly as it does under Mojave. Yep, you’ve got it – with Big Sur, your Thunderbolt 3 Mac is now (essentially) a “Thunderbolt 4” computer! Consider it an early Christmas gift from Apple.' With this week’s release of macOS 11.1, all Thunderbolt 3 Macs now support hubbing. However, we have some big news to report…

We can verify that pre-Thunderbolt 3 Mac models do not support hubbing, and additional ports on these Macs will operate only for USB 3 and up to 10Gb/s (USB 3.1g2 aka USB 3.2). One of the most exciting advances in Thunderbolt technology is that the 4th generation allows for “hubbing” – connecting up to four Thunderbolt devices through one port. That TB2 Macs don't get the Hubbing feature under Big Sur.

Thunderbolt 4 hub mac mini