How can a Mac Pro read a thunderbolt 3 drive?
I have a MacBook Pro 2018 and three Thunderbolt 3 external drives for various purposes. I have been surprised that I am unable to read the two bus powered TB3 drives using my Mac Pro 2013. I have the Apple TB3 (male) => TB2 (female) adapter, but even though it is advertised to run bidirectionally, it does not work with my two TB3 drives (Lacie model LRD0TU6 and TEKq 1Tb drive) which are bus powered. I have tried three different TB2 cables with the same result, which seems to eliminate the TB2 cable as the culprit. This adapter does allow me to operate my OWC TB3 Thunderbay 4 which has its separate power supply from the Mac Pro TB2 port. This suggests that the problem lies with the power bus in the two TB3 bus powered drives.
This problem is a real pain since I need the bus powered drives for their portability in the field, to move data between the MBPro and the Mac Pro. I would be able to tolerate the slightly slower speeds of the TB2 drives which can be read without difficulty on the MBPro using the adapter, but I cannot find any current portable TB2 drives on the market. Several AC powered TB2 drives remain, but the TB2 bus powered portable drives no longer seem to be available.
Any suggestions on how to either run the TB3 drives from a Mac Pro, or how to acquire a TB2 bus powered portable drive?
Thanks!