So yesterday both mine and my suitemate's SD cards went bad; I have an HTC Incredible, he has a Samsung Fascinate. Neither of our phones will read their cards. It'll act like it's reading in the card at first, then immediately say that it has been unmounted. The only thing that we had both done recently was download X Construction the day before, we got the application when it was Amazon's free app of the day. I don't want to jump to conclusions, but this just seems like it would be a crazy coincidence since we have different carriers, phone brands/models, and OS versions.