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Hi, I have 2000 MBps external ssd drive Sandisk Extreme Pro SSD and Im using MacBook Pro 2021 with thunderbolt 4, but only can get 1000 MBps rate tested through Blackmagic. I tried to find an article with this issue but can’t find any.
There has been quite a few reports of slower USB-C native external drive performance, but much better Thunderbolt3 performance! There is a sizable I/O difference between the two USB-C connections! A Thunderbolt3 cable is capable of transferring up to 40 gigabytes of data per second, which is twice the maximum data transfer speed of USB-C. However, in order to hit these data transfer speeds, you must use a Thunderbolt cable with a Thunderbolt port, and not a USB-C port, and lastly the device must be a Thunderbolt drive. USB C vs Thunderbolt 3 Explained
