My Sony Ericsson Xperia Arc suddenly refused to take photos today, and various apps would not run. It seems the phone no longer recognises its SD card. I have tried removing and reinserting the card and restarting the phone a few times but it either says there is no SD card, or the sd card is not mounted. I removed the sd card and inserted it into my Hudl tablet to see if that could read it. It said checking sd card for errors, and eventually said the sd card was blank or had an unrecognised format and offered to format it which I declined. Is the sd card likely to be broken, or could the phone have corrupted it? Is it worth trying to reformat the card (the phone does not offer to do that but maybe there is a formatting tool in its menu somewhere). If I have to buy a new sd card, what type and size should I be looking for?