Hi formatted the pen drive...
When to /media, permissions <userneme> <userneme> and the pen is working, always a pop asking for open, BUT I can't unmount it apparently, a error message appear when I do:
No se puede desmontar el volumen. Details: "Can not remove directory" -
but I can unplug and the pen drive dissapear from PCManFM, and don't crash.
I did it too, I founded in ubuntu forums:
sudo chmod -Rf 777 /media/~
To much problems.