I have a base 13" MBA and disk space is precious. All of my photos are on an external hard disk but I like iPhoto as a photo management software. The thing is, when you import photos into iPhoto, it copies them onto a disk, which I want to avoid because I have some 30GB of photos. Is there a way to see the photos in iPhoto when I plug in the external disk and then I can mess around with them? I can do this in iTunes where I always see what songs I have but can't play them unless my external hard disk is plugged in. Thanks!