Let me explain.
I have moved all my photos from iphoto to my LR catalog. Now I would like to remove all my photos from my mac and move them to an EHD.
You need to copy (not move) the photos, using your operating system, to the external HD, and then reconnect the photos in Lightroom, following these instructions (scroll down to the section entitled Updating Folder Location): Adobe Lightroom - Find moved or missing files and folders Once that is successful, you can delete the photos from your internal HD.
Thank you so much I will go read the link!