[Trisquel-users] Multisystem doesn´t catch my USB

[megver . 2000]

When I opened multisystem it said I had to mount my pendrive in /media, but  
in Trisquel it mounts in /media/user/usb_name, so I changed the directory to  
/media/usb (usb it´s my hdd), but still not working.
Why this happens? How can I fix that?