i am using 64GB SDXC Strontium card Formatted as Exfat in my SP Android V 4.3. because my dream is bigger then 4GB :-P. and its working fine. Just Formate your memory card in windows 7 ( i didn't see exfat option in XP) and very important thing is select allocation size to default. otherwise you will see difficultly in transferring file that it will get ejected in evry minutes. Thanks... i specialy purchased SP to downloads whole day and night why should i leave my computer on and pay high electric bills. just plug the charger and use other phone for call and other stuff.