It always says disk is damaged. I got it to work for a while somehow, and was able to access the disk and load files, but then I reset my phone and the error message comes up again. Then I loaded it into a computer and the files I had loaded were gone, but files I had previously loaded and deleted were there. Phone is also unable to format the card. I thought this phone was supposed to be compatible with these things? I just don't trust the card, since data is on it one second and gone the next. I don't really want to put anything important on it at this point. Anyone else on a US version having any luck with a 64gb card. Mine is a Sandisk UHS-1 card. I'm going back to my class 4 32gb. Too bad, I blew $70 on this card.