Mounting a USB device in Linux

Mounting a USB device in Linux

I have a problem when trying to work with USB devices mounted with user 'root'. I explain, I mount a USB device as root under command line (console mode only), and I can work with that device with no problem, but when changing to one limited account, that device mounted is in read-only mode. I've tried to apply chmod and chown but not to work. Also, I've tried this: