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HID mode means you're using your CDJ as a controller. If you are using USB drives, then you don't need to be in HID mode. The Link button you see on the CDJ is not a "mode." It allows your CDJ to read the USB content of another CDJ that it is "linked" to via an ethernet cable. Take a browse through your owner's manual to get more details. The NXS2 system is fully supported for HID mode. Check to make sure you're using the proper drivers on your computer and that you've got the latest firmware installed on the CDJs and DJM.