Something is up with the Mac Mini M1 when connecting USB-C devices rated 10Gbps. They don't show up as such, instead they are downgraded to 5Gbps.
I noticed that the Phantom Drives DUO was only recognized as a 5Gbps device on my Mac mini System Report, even though it is advertised as a 10Gbps device on Phantom website. And I picked this enclosure because of the advertised speed.
Only I am not getting the speed I should get, instead it maxes out at around 360MB/s, that matches the theoretical 5Gbps max speed.
Same thing with the OWC Mercury Dual Mini enclosure, advertised at 10Gbps, actual tested speed around 360MB/s.
And on top of this, the same dual SSD Raid 0 array reaches 690-800MB/s on a Sonnet Pcie card, which is the expected speed for such an array.
I'm not the only one seeing this, as mentioned in this Reddit post:
Are we forced to upgrade to 40Gbps TB3? Not many devices on the market, all much more expensive than USB 3.1 10Gbps. I understand why now.
And what about USB4? Do these devices even exist? Looks like compatibility is not even guaranteed ?...
UPDATE 1:
Oh boy, there is more to this problem in this Apple Discussion thread. Someone mentions a "bug" in macOS, someone else mentions "Some of those folks have found that using a Thunderbolt3 cable instead of a USB-C cable returned stability and performance."
Damn! I don't have a Thunderbolt3 cable at the ready to test this. That would be dandy if true.
UPDATE 2:
I ordered a Thunderbolt3 cable and I am sad to say that this solution DOES NOT WORK for me with the Phantom Drives DUO external enclosure. I have the same exact speed with USB-C cable or with Thunderbolt3 or Thunderbolt4 cables. Not good.
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