Partition listed as read-only but isn't!

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http://askubuntu.com – I have a 2GB external drive which it appears Nautilus thinks is read-only; but it isn't! Basically I cannot add files and folders by right-clicking. I have tried restarting and it doesn't help. I can open a terminal and go to the folder and it works fine to use the mkdir command (without sudo) and I am also the owner. Right-clicking shows that I am the owner of the folder and that I have read/write access to folders. I can save documents from gedit to it, for example. Using Ubuntu 12.04. Anyone know what's going on here? (HowTos)