Z87 Extreme4
4.4.8 USB Configuration
USB Controller
Enable or disable all the USB ports.
USB 3.0 Controller
Enable or disable all the USB 3.0 ports.
Legacy USB Support
Enable or disable Legacy OS Support for USB 2.0 devices. If you encounter USB compatibility issues it is recommended to disable legacy USB support. Select UEFI Setup Only to support USB devices under the UEFI setup and Windows/Linux operating systems only.
Legacy USB 3.0 Support
Enable or disable Legacy OS Support for USB 3.0 devices.
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