I am looking into getting a newer thunderbolt capable external HD with larger capacity in the near future. I have about 80+% of my photos as referenced files on my present external HD. If I do get a newer HD I will use my old one as a backup to be kept off site. My question is how to move my referenced files from the old to the new external HD and have Aperture recognize them. I know there is a relocate option in Aperture but I am not quite sure of the steps to be taken, i,e., move files to new HD then try to have Aperture find/relocate them, etc. Thanks.