I have a san disk micro sd card(2gb). I updated my songs once in it and placed it in my phone.The next time I tried to update it on my laptop,it showed that the files have been copied but there weren't any of those files.So basically,I cannot move any new files to the card(though they will move but will automatically delete) and also cannot delete the ones that are on the card.In fact I tried receiving files through bluetooth. The file is received but first I am not able to play it and the second time it disappears.But I can send the files that are already on my micro sd card through bluetooth.