Hello All, I see through looking through the forums the problem i have is not unique. But has anyone come up with a definitive solution to the problem? I am trying to change an 8gb sd card to a 16gb in a htc desire z. I have copied all the files to PC, and then put them all on the new sd card (micro sdhc class 4), a total of 66 files, 7.4gb. But when I put the card into the phone, it mounts ok, but all that remains is 22 files and about 2.3gb. All the media files (photos, music, books etc) have disappeared. I tried reformatting the card on PC but it still keeps losing the data when put in the phone. I have also tried the card in my htc legend, and it did the same thing in that too. Maybe the new sd card is faulty? Thanks if you can help.