Hi ! How to identify a 2.0 usb on the Mac mini because I was told that they are not all 2.0

Someone knows how to identify the usb 2.0 on a mac mini because I use the mini just for music and I have been told that they are not all 2.0.

Actually, you can have a mixture of USB2.0 and USB 3.0 devices on the 2012 Mini's. USB3.0 devices will operate at 3.0 speed and USB2.0 devices will operate at 2.0 speed. It all depends which device is plugged in first not the slowest speed device. So, if a USB3.0 device is plugged in first, it will use SuperSpeed and USB2.0 devices will use High-Speed. If a USB2.0 device is plugged in first, ALL devices (3.0 and 2.0) will operate at High-Speed (USB2.0).
In the System Information under USB there are two types of USB hubs. One is USB High-Speed Bus which will show the USB2.0 devices. Another is USB SuperSpeed Bus which shows the USB3.0 devices. You can see your devices under each Bus.
Below is from this Apple Link:
How do I get the best performance from the USB 3 ports?
The first device you plug in will configure the port, so always connect USB 3 capable hubs or devices first.
What happens if I plug in a USB 2 device into the USB 3 port first?
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).

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