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:
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The Ralink USB Driver software package is designed to help you use the Ralink wireless devices with your Mac computer. The software creates a communication path between the operating system and the. If you are using Mac OS X v10.8 or earlier, Use the 'Yamaha USB Audio Driver'. When using the above products, even if the USB Audio Driver is not installed, a class compliant driver (OS standard driver) is automatically applied when the product is connected to the computer with a USB cable.
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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
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.
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If your Mac doesn't recognize a USB device after you plug it into your Mac:
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- 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.
Note: This document was previously titled Working With USB Device Interfaces.
The I/O Kit provides a device interface mechanism that allows applications to communicate with and control hardware from outside the kernel. This document focuses on how to use that mechanism to create an application that detects the attachment of a USB device, communicates with it, and detects its detachment.
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This document does not describe how to develop an in-kernel driver for a USB modem or networking device. If you need to do this, refer to the documentation and sample code listed in See Also.
Important: If your application is sandboxed, it must request the
com.apple.security.device.usb
entitlement in order to access USB devices.Organization of This Document
This document contains the following chapters:
- USB Device Overview provides an overview of USB device architecture and terminology and describes how USB devices are represented in OS X.
- Working With USB Device Interfaces describes how to use the device interface mechanism to create a command-line tool that accesses a USB device. Mafia for mac.
- Document Revision History lists the revisions of this document.
See Also
The ADC Reference Library contains several documents on device driver development for OS X and numerous sample drivers and applications.
- Accessing Hardware From Applications describes various ways to access devices from outside the kernel, including the device interface mechanism provided by the I/O Kit. For an overview of the I/O Kit terms and concepts used in this document, read the chapter Device Access and the I/O Kit.
- I/O Kit Framework Reference contains API reference for I/O Kit methods and functions and for specific device families.
- Sample Code > Hardware & Drivers > USB includes both application-level and in-kernel code samples. Of particular relevance to this document is the application-level sample USBPrivateDataSample.
- OS X Man Pages provides access to existing reference documentation for BSD and POSIX functions and tools in a convenient HTML format.
- The usb mailing list provides a forum for discussing technical issues relating to USB devices in OS X.
If you need to develop an in-kernel driver for a USB modem or networking device, refer to the following:
- IOKit Fundamentals describes the architecture of the I/O Kit, the object-oriented framework for developing OS X device drivers.
- ADC members can view the AppleUSBCDCDriver project in the source code for OS X v10.3.7 and later, available at Darwin Releases. To find the source code, select a version of OS X equal to or greater than v10.3.7 and click Source (choose the source for the PPC version, if there's a choice). This displays a new page, which lists the open source projects available for the version of OS X you've chosen. Scroll down to AppleUSBCDCDriver and click it to view the source. Be prepared to supply your ADC member name and password.
- Additional code samples that demonstrate specific in-kernel driver programming techniques are included as part of the OS X Developer Tools installation package in
/Developer/Examples/Kernel/IOKit/usb
.
If you're ready to create a universal binary version of your USB device-access application to run in an Intel-based Macintosh, see Universal Binary Programming Guidelines, Second Edition. The Universal Binary Programming Guidelines describes the differences between the Intel and PowerPC architectures and provides tips for developing a universal binary.
If you are working with a device that complies with the USB mass storage specification but declares its device class to be vendor specific, see Mass Storage Device Driver Programming Guide for information on how to ensure the correct built-in driver loads for the device.
Apple provides additional USB information (including the OS X USB Debug Kits) at http://developer.apple.com/hardwaredrivers/usb/index.html.
A detailed description of the USB device specification is beyond the scope of this document—for more information, see Universal Serial Bus Specification Revision 2.0 available at http://www.usb.org.
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