Does my computer have a certified USB port?

Why is a USB port still installed in a current usb 3 slot Wanting to purchase an external hard drive for my notebook to back up my photos How do I determine if I have a USB 2 or 3 usb 30 slot As compared with earlier versions, USB offers power at 5 volts nominal The unit load for USB is 100 mA, but it has increased to 150 mA

usb slot types Q I have a fairly recent laptop, bought last year, running Windows How do I tell if any of the three USB ports on there might be USB