I've got the same problem as above.  Updated the OS on my Xperia C5 Ultra Dual this morning, and apart from having to spend six hours completely rebuilding the phone as a result, my SD card has been flagged by the phone as corrupt ever since.  I've tried repeatedly to reformat on the phone but the problem remains.  Put the SD card in the computer to back up before I started and was read fine, so have saved all data.  Also bought new, Sandisk SD card to try, that is also apparently corrupt, and can't be formatted.  It's clearly the disastrous software update that has caused this, so what's the fix?  Won't be buying Sony again, BTW, after this experience. ... View more