They would on my older Macbook with Snow Leopard.īut I had to find out why. I had bought a couple Seagate externals then and Sierra wouldn't format. Never had error or fail to format issues till I moved to Sierra last summer. I have had numerous issues with my HDD docks, but the two I have are early (2012-2013) USB3 docks so it may be that an updated one will work more reliably. This one HDD doesn't seem to like being connected to a non-powered hub (I haven't tried it with different models of hubs, I have tried it with two of the same type and the HDD itself is AC-powered). Re: Seagate external drives - I have something like ten of them and all of them but one has worked without problems in terms of USB connection, working with different hubs. In my case, 3 of the devices I have connected to the Mini need power, the other doesn't (AC-powered hub). My guess is that there may be some power issue that causes certain combinations to work. This contrasts with my 2009 Mini, where there are two "USB Bus" in the System Profiler so in that case if you have higher throughput (relative to USB2) devices, you want to distribute them between the two buses. All of the external USB ports connect up to the same "USB 3.0 Bus" (according to the System Information app) which would connect to the CPU or a PCH (Platform Hub Controller). I have no idea if there would still be an issue if I changed ports or not. I just labeled what devices worked in which ports and have stuck with that through Sierra and High Sierra.
This was with El Capitan when I got the Mini. However, I have experienced what you have in terms of certain devices not working with certain USB ports on my 2014 Mini. I have not seen anything on the web that indicates otherwise although I haven't much research on the topic. I would agree with post #2 that all the ports should be the same. With the USB3 Mini's (so 2012, 2014), it is not the case that connecting and running them at the same time will slow the USB3 drive to USB2 speeds (though if you have an external SSD, you might not have enough bandwidth to run multiple devices at the same time at the same speed they have when no other device is running). Sometime ago I did a test with a USB2 and USB3 external drive as well as a USB2 input device connected at the same time with the 2 external drives transferring data at the same time. After plugging or un-plugging a device, you need to do File->Refresh (Cmd-R). You can see what effect plugging in a device has on the device tree. With regards to the OP's question, with the 2012 Mini, if you run the System Information app (under Hardware->USB), you'll find that devices you connect to the 4 USB3 ports show up under the "USB 3.0 Bus", regardless if it's USB2 or USB3 or a keyboard. Then, on the 2012 Mini, tried in turn a USB2 and USB3 flash drive - nothing unusual - they showed as they're supposed to in the System Information app. The USB3 drive shows USB3 speeds, both in the System Information app and with the Blackmagic Disk benchmark. So I tried this on both my 20 Mini's: Started the Mini with only the USB keyboard (with attached mouse) plugged in.
In my experience on my Macs (don't have one with a USB-C port), it didn't seem to matter. I don't know if this article applies to only Macs with the USB-C port or all Macs with USB3. Is that the "hub" that's being referred to in the 2nd question? I'm just confused with what they're trying to say.
Now, there is an internal "hub" that shows up (at least on 2012 Mini) under the USB 2.0 Bus tree in the System Information app. If you have a USB2 hub, you'll get USB2 speeds max on the connected devices - nothing revelatory about that. Which one is the first at power-up or restart? The second question/answer is confusing. Which doesn't make much sense if you always have different USB types always connected to your computer. If you plug in a USB 2 hub first, all devices connected or "daisy-chained" to that hub will operate up to the maximum transfer rate of USB 2 speed (480 Mbps). What happens if I plug in a USB 2 device into the USB 3 port first? The first device you plug in will configure the port, so always connect USB 3-capable hubs or devices first. How do I get the best performance from the USB 3 ports?
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