USB-B Cable: Square, Reliable, Everywhere
The plug that fits nothing else in the drawer is USB-B, and devices that use it tend to run for a decade or more.
Quick Answer
| Variant | Shape | Speed | Common devices |
|---|---|---|---|
| USB-B 2.0 | Square, bevelled corners | 480 Mbps | Printers, scanners, hubs |
| USB-B 3.0 | Wider, taller section on top | 5 Gbps | Faster drives and docks |
| Mini-B | Small five pin | 480 Mbps | Cameras, older devices |
| Micro-B | Smaller still | 480 Mbps, 3.0 variant exists | Drives, phones of its era |
Choosing a Replacement
Match the socket
Wide socket takes the 3.0 plug. Standard socket takes 2.0 only.
Data capability
Charge only cables look identical and transfer nothing. The most common fault.
Host end
Usually USB-A. C only machines need a C to B cable or an adapter.
Length
One to three metres covers most desks and racks.
Why the Device Does Not Appear
- Cable is charge only. Test with another.
- Wrong plug variant forced in, or a loose fit.
- Port issue on the computer. Try another.
- Device in an error state.
- Driver missing on the host.
Real-World Applications
- Office printers and scanners.
- Label printers in workshops.
- Audio interfaces and instruments.
- Older external drives.
Related Guides
For the double ended form, read USB-A USB-B cable guide. For the printer context, see USB printer cord. For Mini-B, start with USB Mini B cable.
FAQ
What is the square plug called?
USB-B, in 2.0 and 3.0 variants.
Do I need the 3.0 version?
Only if the device has the wide socket. Most printers do not.
Why does mine charge but not transfer?
A charge only cable.
Can I get a longer one?
Yes, within the roughly five metre limit of USB 2.0.