I took it out for the first time on an aerobatic flight in a biplane. Everything seemed to work fine until I was reviewing the files. There were 2, out of 5, that were very small so I was going to delete them individually. The first was deleted as expected but when I tried to delete the second, the other 3 also disappeared. Now I have to figure out if I can recover them because that was a once in a lifetime experience that I don't want to lose.