"Kyle Kucharski/ZDNET Have a USB device near you? Look closely at the port -- do you see a color? It turns out that it actually means something. There's a standardized color scheme that communicates information about that device's capabilities. Mind blown? If you never noticed this, you're not alone. Most USB devices work fine on any compatible port, but they may not be optimized for optimal performance. For example, if you've noticed a mouse seems to work better in one port over another, it's not in your head."
"Also: Drawer full of USB cables? This tiny tester tells you which ones actually work as advertised Despite the fact that they share a universal port shape, all USB-A and USB-C devices are not created equal, with potentially very different transfer speeds, power transfer, and generations of similar devices. Even two USB-C ports right next to each other on the same laptop could have very different capabilities when it comes to data transfer speed and power delivery."
USB port colors convey the port generation, expected data transfer speeds, and power-delivery behavior. Seven major colors are used to indicate those differences across USB-A and USB-C ports. Devices share a universal connector shape, but transfer speeds, power delivery, and supported USB generations can vary widely; adjacent ports on the same laptop can differ in capability. Black denotes USB 2.0 with up to 480 Mbps. White denotes USB 1.x with speeds typically not exceeding 12 Mbps and appears on low-power devices. Yellow ports are "always on" and can support USB 2.0 or 3.0, while orange is always on with USB 3.0 support.
Read at ZDNET
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