I have an iPad. I down loaded photos on it by using the card reader apple sells. Now I cannot seem to get the photos off the iPad. When I sync and sync only certain photos the ones I loaded with the read still appear. When I go to iPhoto to download the photos and tell it to delete originals some so and others don’t. I get an error message that some files are not downloadable. I use a nikon and take my photos in raw format. I want ton use th iPad as a back up in the field. Any suggesttions?