ASRock H61M-XT PLUS User Manual - Page 37
USB ConIguration
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CSM Please disable CSM when you enable Fast Boot option. The default value is [Enabled]. 3.4.8 USB Coniguration USB 2.0 Controller Use this item to enable or disable the use of USB 2.0 controller. Legacy USB Support Use this option to select legacy support for USB devices. There are four coniguration options: [Enabled], [Auto], [Disabled] and [UEFI Setup Only]. The default value is [Enabled]. Please refer to below descriptions for the details of these four options: [Enabled] - Enables support for legacy USB. [Auto] - Enables legacy support if USB devices are connected. [Disabled] - USB devices are not allowed to use under legacy OS and UEFI setup when [Disabled] is selected. If you have USB compatibility issue, it is recommended to select [Disabled] to enter OS. [UEFI Setup Only] - USB devices are allowed to use only under UEFI setup and Windows / Linux OS. 36