I'm sorry I may not have been clear. I do the same thing, I download all vids and pics after every flight, I was just wondering why I keep reading people saying they "reformat" the card each time, after downloading. I was saying I only formatted the card once, when I bought it. My question was "do I need to reformat the card every time I use it and if so, why"
I'm the same way, but I use photo for mac, and just click the little button that says delete when imported. This way, photo keeps my photos and videos organized.