nintendo ds how do you get more than 100 games whith the itouch card?

i have got a ds lite and a itouch card and a sd 8Gb,as i play the games it opens up a save file and each time i choose to play another game it opens up more save files and if i keep on choosing games when the counter reachers 99on the ds it then starts to erase the games,what i need to know is can you make the counter go above 99,and how do youdo this or do i have to save the games in the fav file, but then i am still only going to get about 50 games, or is there something i am doing wrong.