search for files not working on external usb drive- debian 7

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http://www.linuxquestions.org – ok be gentle with me please... I have an external hard drive which mounts correctly but I am unable to search the contents of the drive using file search. If however I use catfish I can search the files no problem, This is all on the Gnome 3 desktop by the way If I use the xfce desktop, search for files works perfectly, what on earth am I doing wrong?? Thanks in anticipation (HowTos)