When i mount the usb (sudo mount /dev/sdb1 /media/usb-drive) i cannt access to /media/usb-drive, permiss denied, if i umount the usb i can acces to /media/usb-drive.
So when usb is mounted i cannt access /media/usb-drive but if is umounted i can access/read/write at /media/usb-drive without problems.
I dont know where is the problem, im a little newby at ubuntu.