I was wondering if there is a way to relocate the master files, but keep the file structure I have created in aperture. That is --I have been using aperture to manage all of my images, in raw, and fear that I will soon run out of hard disk space. I would still like to see all of the previews of my images and such, but I wouldn't mind having aperture reference my images and I would keep only my most current project on my internal drive (of course I have all of my images backed up). But as my library grows I would incrementally move my old images to their new home on an external disk. Is there an easy way to do this in aperture?