massimo@massimo-TravelMate-2700:~$ sudo mount 7dev/sdb1 /mnt 
[sudo] password for massimo: 
mount: il device speciale 7dev/sdb1 non esiste
massimo@massimo-TravelMate-2700:~$  sudo touch /mnt/prova 
massimo@massimo-TravelMate-2700:~$