LR3>LR6 / All dng's on 1 new HD /App 10.10.2 / Can see ALL of the images in 'Library' as thumbnail as well as the lrgr image on screen, BUT can not modify image. There is an '!' on the image , it says 'File can not be found'. In what I think you call the cat., is the list of all the files of a particular shoot, all in the order as they have always been listed. The folder symbol to the LH side of the name for that shoot has a '?' on it. Can rt click that file find missing fldr- this works. Is there some way to do a mass move of all the files into the new hard drive, NOT one at a time???