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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 ports, and each type has a unique shape. On Mac computers, USB is available with these ports, depending on your Mac model:
USB-A
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 oriented correctly.
USB-C
Type USB-C ports are available as either standard USB-C ports or Thunderbolt 3 ports that also support USB-C connections. They both look the same, and the connector plugs 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
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>USB specifications on MacData transferPowerUSB 3.1 Gen 2 Also known as USB 3.2 Gen 2 Up to 10 GbpsUp to 15W at 5VUSB 3.1 Gen 1 Also known as USB 3.2 Gen 1 or USB 3 Up to 5 GbpsUp to 900 mA at 5VUSB 2.0 Up to 480 MbpsUp to 500 mA at 5VUSB 1.1 Up to 12 MbpsUp 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 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 that 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 recognize 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 maker of your device, and install all available Apple software updates as well.
If your device came with an AC power adapter, 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.
Learn more
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 or Thunderbolt 3 can charge over that port using a compatible USB-C power adapter and cable.
The USB-C Digital AV Multiport Adapter connects the following devices to a display that uses an HDMI cable:
This adapter also connects your Mac or iPad Pro to USB-A devices, and it includes a USB-C port for charging your Mac notebook or iPad Pro. All three ports can be used simultaneously.
Video
HDMI
Use the HDMI port of this adapter with a display, TV, or projector that connects using an HDMI cable. It's HDCP compliant and supports the specifications below, depending on the model of the adapter.
The model number is printed on the retail box and the side of the adapter, near the ports.
Model A2119 is the newest model of this adapter. It supports HDMI 2.0 at these resolutions and refresh rates when used with macOS Mojave 10.14.6 or later or iOS 12.4 or later. It also supports HDR video in HDR10 and Dolby Vision formats when connected to a compatible playback device and display, TV, or projector.
Up to 1080p at 60Hz
3840 x 2160 at 30Hz
3840 x 2160 at 60Hz with these devices:
16-inch MacBook Pro introduced in 2019
15-inch MacBook Pro introduced in 2017 or later
13-inch MacBook Pro with four Thunderbolt 3 ports introduced in 2020
MacBook Air introduced in 2020
Retina iMac introduced in 2017 or later
iMac Pro
iPad Pro
Model A1621 supports HDMI 1.4b at these resolutions and refresh rates when used with macOS Sierra 10.12 or later or iOS 12 or later:
Up to 1080p at 60Hz
3840 x 2160 at 30Hz
After connecting your display, TV, or projector, video from your Mac or iPad Pro should appear within 10 seconds.
Data transfer and charging other devices
USB-A
Usb Adapter For Macbook
Use the USB-A port of this adapter with flash drives, cameras, and other devices that connect to USB-A for data transfer or charging. It supports USB 3ve plugged all cables into the adapter before plugging the adapter into your Mac or iPad Pro.
Learn about using 4K displays, 5K displays, and Ultra HD TVs with your Mac.
Usb Converter For Macbook Air 2019
These devices aren't compatible with this adapter:
Usb Converter For Macbook Air
G-Technology G-DRIVE mobile USB 3.0 Hard Drive (Apple part number HF4F2VC/A)
Apple USB SuperDrive model manufactured before Fall 2010