I recently purchased an external hard drive, and put all my music and videos on it. Changed the settings in iTunes so the music library on the external hard drive. Now, everytime I try to update the ipod iTunes freezes and won't update the ipod. Using iTunes with the external is fine, but everytime I plug in my ipod it just gives me the rainbow spinning thing when my cursor is over itunes and in the activity monitor it says that itunes is now responding. Anyone know what's the problem?