[kubuntu] mount and unmount ext4

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http://ubuntuforums.org – Hi everybody! I try to mount a partition in ext4, and i was following this french thread : http://forum.ubuntu-fr.org/viewtopic.php?id=383127 but, i was stuk at 2 line (of command) next the end.... It was possible to view the /media/video in ext4, but it was impossible to write on it... And i saw a folder in /media/video, is name was lost&found, like the home folder, before the user.... And after i was bored of this so i start Gparted, unmount, format in ntfs format... (cuz it just for data...) Now each time i reboot, the system stop, and i need to press F1, to see a message that displ (Hardware)