"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. Let's take a look at what they mean."
"Black: Denoting USB 2.0, this is the second most common you'll see on devices of all types, supporting speeds of up to 480 Mbps. White: These are first-generation devices -- USB 1.x -- with the slowest potential transfer speeds that don't typically exceed 12 Mbps. They're also some of the most common, found on devices that don't require data transfer or high power delivery."
USB port colors indicate the port generation, expected data-transfer speeds, and power delivery capabilities. Seven major colors signal different performance levels and features. Black generally denotes USB 2.0 with up to 480 Mbps, while white marks USB 1.x with much lower speeds around 12 Mbps for low-power or non-data peripherals. Yellow and orange identify 'always on' ports that can supply power when the host is off, with orange typically adding USB 3.0 support. Blue denotes USB 3.x speeds. Physically identical USB-A and USB-C ports can still differ in speed and charging capability, so match ports and cables for optimal performance.
Read at ZDNET
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