I have a library where all of the content should be excluded from search. I have unchecked "Allow items from this document library to appear in search results." I have also removed the site from appearing in search results. When a user types any character into the "search this site" box on the home page, in the drop-down that appears on the page, results appear that are from this library. If the user clicks enter, no results appear on the following page. The results in the drop-down appear to only be from the Name column, no other metadata. This seems like either a bug in the drop-down programming or there's a setting somewhere I've missed.