External HD Problem, F11

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http://forums.fedoraforum.org – Hi everybody I have a problem with a LACIE external HD. The problem started when accidentaly I unplugged my HD without unmounting it. Now I can´t write on it, and when the system mounts it automatically it's only as read-only. I would like to know if someone can gelp me. I have tried chown and chnod commands but cant solve this Greetings. (HowTos)