I have an iomega 1 tb hard drive which I have been using with my pc and have put all my photos on there with a view to only using my new iMac for photography. I can see the iomega hard drive in finder and can open photos from it in iPhoto but am unable to drag the iPhoto library to it to back up photos on my iMac (none of which are on my pc). Any ideas that will enable me to back up so my whole library of pc and iMac photos are on the same hard drive? Thanks