Hi, I am going to create ext3 file system to an external USB HDD for being used as an backup storage. I am not clear if it is necessary to reserve super user blocks (5% by default), could you please advise? If the super user block is not needed, I guess I should use following command, is it correct? $ /sbin/mke2fs -m 0 -j /dev/sda1 Thank you. Kind Regards, Jupiter