Can't locate USB drive(s)?

I have two identical USB drives attached to my Infrant via USB. They're in enclosures that don't provide any visual feedback when I try the "locate" option, and FrontView doesn't tell me which USB port is housing which drive. I only need one of these drives attached now, but I don't know which one to pull the plug on. Is there a way to see where these are mounted without having a PhD in the CLI?

Thanks!