My old brain just forgets stuff like this. I get mixed info trying to find this info. The manuals vagually cover this and the instructional videos ? well I just got mixed up. All my cards are 32gb or less and format to fat 32. If someone could explain the numbers inside the U or the circle I would just be so happy. I aminto re_ learning how to fly these 3 birds,just a little confused. Any and all help is so much appreciated. I have received tons of help in the past and will be explaining what I find as I go along! Thanks. Peace KC