Can't copy/cut/paste into my external harddrive

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http://askubuntu.com – I have a 1 TB external hard drive and I can't write anything on there. I have some movies on there and I can watch them perfectly fine but I can copy new files to there, it's just grayed out. I have tried: sudo chmod 777 -f -R /media/jeggy/INTENSO but that didn't work, any help would be great jeggy@jeggy-XPS:~$ mount | grep INTENSO /dev/sdb1 on /media/jeggy/INTENSO type vfat (rw,nosuid,nodev,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks2) jeggy@jeggy-XPS:~$ ls -l /media/jeggy/INTENSO ls: cannot access /media/jeggy/INTENSO/lampp: Input/output error (HowTos)