[ubuntu] external hard drive is read only

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http://ubuntuforums.org – i use an external hard drive to keep my movies on to watch on my xbox. i went to add a movie and it says error desination is read only. i am the owner and it says it is a read only filesystem. when i ran smart data and the only red flag is reallocated sector count. i plugged it into my windows machine and ran chkdsk it said it fixed it. i guess it didnt. i had no problems with it yesterday. it is ntfs file system and i am running ubuntu 11.10. any help is appreciated thanks (Hardware)