I have a similar question. I know I can format the card under Windows (making sure to use FAT) but once I do that I have a blank card, right? How would I set the card back up again? simply put the G6verify and G6loader back on the card with windows and then boot in GBA mode? (same way you would if you were updating?)
use that utility, I forgot what it's called.......mp3utility or something...