Why don't PCs come with only USB-3 ports?

0 port , T420 systems do not have any ports The yellow USB port simply means that it can supply power to external devices (charge

Check the physical ports on your computer: · If you see a blue USB port, it's USB · It may also be marked on the outside of the port with

usb a slot Leading quality standard of Ultra Durable™ 3 technology with 2oz copper PCB design · Supports newest NEC SuperSpeed USB with superfast transfer rates of up

usb c slot ALOGIC USB SuperSpeed 3 Port HUB and Gigabit Ethernet Adapter