when you need to deconnect and reconnect to the console instead of waiting the end of a command

 # tmux
=> run the command and close the console
# tmux attach       /// to reconnect where you leave the consoleit
# exit              /// to quit the session

https://dekoder.wordpress.com/2014/10/08/fixing-freenas-currently-unreadable-pending-sectors-error/ (lire jusqu'à la fin - erreur dans la commande!!)