Key Takeaways
- USB 3.0 may not always be compatible with older devices, making USB 2.0 a necessary fallback port on laptops.
- Basic peripherals like keyboards and mice don't require the high speeds of USB 3.0, making USB 2.0 sufficient and cost-effective.
- USB 2.0 consumes less power and doesn't significantly impact a laptop's total power draw, making it a practical choice for low-draw devices like security keys.
If you've bought a non-ultra book laptop, you may have noticed that one of your USB-A ports doesn't sport the same blue interior color as the rest. That's because that port uses USB 2.0, a standard released in 2000! But why?
USB 3.0 is Not as Backwards Compatible as You Think
On paper, USB 3.0 in all its iterations is backwards compatible with USB 2.0 and USB 1.1. In practice, it's not too uncommon to find that some USB 2.0 or older devices just don't behave correctly or even work at all when plugged into a USB 3.0 or later port.
Not every USB host controller manufacturer seems to get backward compatibility right, so this is one rather good reason to leave at least one USB 2.0 port on a laptop in case there's ever an old USB 2.0 flash drive or some other old device that's still in use. You may not be using very many (if any) really old pieces of tech from the USB 2.0 era, but we can assure you there are lots of organizations out there that are on account of how slowly hardware is updated in many companies and schools. Many laptops are designed as much for a corporate and education environment as they are for a home environment.
USB 2.0 Is a Good Fallback Port
USB 2.0 is so old at this point that there's no modern operating system that doesn't have native support for it built in. Imagine you've just installed a fresh OS, your laptop has no optical drive (though you really should own one), and none of the USB 3.0 ports work because you need to download and install drivers for them.
Ideally, the operating system has some sort of basic driver that will get you by, but there's no guarantee. That single USB 2.0 port can be a lifesaver for restoring your drivers and system to full functionality.
