I got a tt 920 i put a little bit of stuff like 2 songs and 1 picture just to try the card out but it doesnt work. When i started up tomtom home it shows the sd csrd synbol i picked the card but there is noting on it. I also have a card reader and the card reader picked it up. BTW i am using a Canon 16MB card only planing on a bigger one when i solve this problem any ideas