New Galaxy S3 JellyBean. Installed a 64GB San Disk Mobile Ultra. Formatted it with the Phone. Transferred the files to the external memory with the San Disk Memory Zone. The files were initilally there but then disappear but the capacity says that they are still there. Removed memory, did a full format on PC, put back in and formatted with phone again. Transferred files from phone again and viewed with the Memory Zone app and the initilally displayed but then files started going away, although the capacity said that they were still there.