I agree with Emily here. At a workshop I was taught to format in the camera I was going to use. Even if card had been formatted in another camera, I would start by formatting it in the camera I was going to use it in. Of course, this is AFTER you have offloaded all the images and hopefully backed them up. Rene -----Original Message----- From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of Emily L. Ferguson Sent: Friday, August 30, 2013 5:28 PM To: List for Photo/Imaging Educators - Professionals - Students Subject: RE: Question re: shutter activations I find it's really necessary to reformat the card in the camera you're going to use it in, even when all your cameras are the same model. -- Emily L. Ferguson mailto:elf@xxxxxxxxxxxxxxxxxx 508-563-6822 New England landscapes, wooden boats and races http://www.landsedgephoto.com HOT OFF THE PRESS! SAILING SEPIA IMAGES VOL II: http://www.lulu.com/spotlight/elfpix Check out my Spring daily photograph project at: http://tinyurl.com/3a6m7g6 And Summer: http://tinyurl.com/22juo5s Autumn now complete here: http://tinyurl.com/26pdgz9 Winter concluded here: http://tinyurl.com/2co5wkg