Thank you! I was using a Nikon D610 for both sessions. I have had it probably 4 or so years now so it has definitely gotten a workout. I will definitely be replacing both cards now. They were SanDisk brand cards. My computer has an sd card reader, so that's how I normally transfer my pictures to my computer. Luckily neither picture was essential. I had others that will work fine. I just don't want to get in a situation where I don't have a picture when I need it. Thank you so much for all of this information. I truly appreciate it!