root@vuduo:~# mount -t ext3 /dev/sda1 /media/hdd
mount: mounting /dev/sda1 on /media/hdd failed: No such file or directory
root@vuduo:~# umount /dev/sda1
umount: can't umount /dev/sda1: Invalid argument
root@vuduo:~# mount -t ext3 /dev/sda1 /media/hdd
mount: mounting /dev/sda1 on /media/hdd failed: No such file or directory
root@vuduo:~#