Longer USB cables can slow data and power
Engadget explains that USB cables have recommended maximum lengths, and going past them can cut transfer speeds and the power your devices receive.
The facts
- According to Engadget, the USB Implementers Forum (USB-IF) sets recommended maximum lengths: 16.4 feet for USB 1.0 and 2.0, 9.8 feet for USB 3.0 through 3.2, and 2.6 feet for USB 4.
- The USB-IF is an industry group, not a regulator, so makers can sell longer cables. Engadget says going past the limits could hurt performance.
- A cable that is too long won't stop working. Data may move more slowly or devices may get less power, and USB-A and USB-C have the same limits.
- Engadget lists fixes: an active USB cable or extender, which costs more and draws extra power from the port, or a powered hub with the longest supported cable to the computer.
Case notes · Danny's take
Why it matters
Newer USB means faster, but it also means shorter. Most people blame the laptop or the phone when a transfer crawls. The cable is the cheap, boring suspect nobody checks. Check the evidence before you replace the device.
For builders
If you design desks, docks or hardware setups, plan cable runs around these limits. A long cable that quietly cuts speed is a support ticket waiting to happen.
Not financial advice. Do your own investigation.
This story was summarised with AI from Engadget's reporting and checked against our editorial policy. Danny's take reflects his views. Disclaimer.
Danny Walter
Founder of Moon Republic, Volt Terminal and Moon Republic Academy. Author of The Market Is a Crime Scene and After the Applause.