USB port types and names
USB (Universal Serial Bus) is an industry standard for connecting computers and other devices. It's available with many types of port, and each type has a unique shape. On Mac, USB is available with these ports, depending on your Mac model:
Type USB-A ports are commonly called USB, USB 2 or USB 3 ports, depending on the USB specification they support. They aren't reversible, so a USB-A connector plugs into the port only when orientated correctly.
Type USB-C ports are available on Mac as standard USB-C ports, Thunderbolt 3 ports and Thunderbolt/USB 4 ports. They all look the same and the connector can be plugged into the port in either orientation.
Learn more about identifying the ports on your Mac, as well as the adapters and cables you can use to connect older devices to type USB-C ports.
USB specifications are important primarily when you want the most speed and power for your USB device, or your device needs more power or is using too much power. Every USB port supports a particular USB specification, which determines the port's maximum data-transfer rate (speed) and power delivery when used with a USB cable and device that meets or exceeds that specification.
|USB specifications on Mac||Data transfer||Powerdelivery|
|USB 4||Up to 10 Gbps||Up to 15W at 5V|
|USB 3.1 Gen 2
Also known as USB 3.2 Gen 2
|Up to 10 Gbps||Up to 15W at 5V|
|USB 3.1 Gen 1
Also known as USB 3.2 Gen 1 or USB 3
|Up to 5 Gbps||Up to 900 mA at 5V|
||Up to 480 Mbps||Up to 500 mA at 5V|
||Up to 12 Mbps||Up to 500 mA at 5V|
To learn which specification is supported by a type USB-A or type USB-C port on your Mac model:
- Choose Apple menu > About This Mac, click Support, then click Specifications.
- Check the System Information app for more details, including about USB devices connected to USB ports on your Mac. Select USB in the sidebar, then select a USB bus on the right.
Get the best performance from your USB devices
USB specifications all work with each other, but speed and power are limited by the cable or device that uses the earliest specification. For example, if you connect a USB 3 device to a USB 2 port, your device is limited to USB 2 speeds, and it can't draw more power from the port than can be delivered over USB 2. In other words, to get the best performance, make sure the USB port on your Mac and the USB cable to your device meet or exceed the USB specification of the device itself.
If your Mac doesn't recognise a USB device after you plug it into your Mac:
- Check all connections: unplug the device from your Mac, then plug it back in, and make sure that all cables and adapters are securely connected at both ends. Test with another cable or adapter, if available.
- Plug the device directly into your Mac instead of a USB hub or other device, and if necessary test with a different USB port on your Mac or device.
- Some devices need their own software, such as drivers or firmware. Others work without additional software. Check with the manufacturer of your device, and install all available Apple software updates as well.
- If your device came with an AC power adapter, you should use it. Some devices can be powered by the USB port on your Mac. Others need more power than your Mac can provide.
- Restart your Mac.
- USB 3 devices can create wireless interference that affects Wi-Fi and Bluetooth devices. Learn how to resolve Wi-Fi and Bluetooth issues caused by wireless interference.
- Mac notebook computers with USB-C, Thunderbolt 3 or Thunderbolt/USB 4 can charge via that port using a compatible USB-C power adapter and cable.