I wanted to bring some music out to play,,,,so I had a 256 sd card in my digital mp3 player full of music......I popped it in my x5 and guess what??????It came up to format........my mistake.......I lost it all.......Sandisk,,,yep......will know better next time......Have been using a 64 sd card with no prob..........this card will definately go back in the mp3 player and never see the inside of my axim again!!!!!!!!!!!!

live and you learn.......also use a 256 compact flash card in the x5 , and have no prob...............