I have some image files on a portable disk drive which I have already imported and worked on. While decorating the room I dismantled the computer and am not sure which port I used to plug in the drive. I cannot re-import ad lightroom says the photographs have already been imported but when I look at the drive they don't appear to be there on lightroom, although they are on the drive if viewed in Explorer. I don't know how to access these images on lightroom. What should I do to be able to work on them.