Finding speed of USB ports

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Most systems come with variety of USB ports of varying speeds USB, USB 2.0 and USB 3.0. In case it is important for a device to be connected to a very fast USB port then it is necessary to determine speeds of various ports. To find speed of various ports use:

cat /sys/bus/usb/devices/usb?/speed

Then use 'lsusb' to check on which bus is the desired device connected. Then as per requirement change the port so that device is connected to right bus for best possible speed.

Table of various USB speeds for reference

Speed type	USB version	Bandwidth
Low-speed	1.0+	1.5Mbits/s
Full-speed	1.0+	12Mbits/s
High-speed	2.0+	480Mbits/s
Super speed	3.0+	5000Mbits/s

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