

Once again, someone misreports the number. It’s not 6% of desktop OS market share. It’s 6% of all OS market share. There’s about 50-50 split between desktop and mobile OSes, which means the correct desktop market share of Linux, according to that site, is 12%.
And the easiest way to figure out the USB version is to look at the USB port and connector. If there is white or black plastic piece inside of them, it’s USB 1 and 2 respectively. If the plastic part is blue, red or some other color, it’s USB 3 or better.