Usb Configuration - ASROCK iEPF-9000S-EX4 User Manual

5.3.6 USB Configuration

Legacy USB Support
Use this option to enable Legacy USB support. AUTO option disables
legacy support if no USB devices are connected.
USB Power Control
Use this option to control USB power.
M.2 Key_B USB Function
Use this option to enable or disable M.2 Key_B USB Function.
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