I'm running 362.2_2 on an rt-ac3100. When I plugin a small 4gig thumb drive into either usb port it does not show up at all in the web interface or in the ssh terminal. Do I need to plug in a powered usb drive? I tried running amtm to format it and amtm said it could not find a usb device. I have never used the usb ports until now. I want to install diversion and skynet. I did already format the drive as ext4 on another box.