After copying an mp3 file to my phone via USB it says "Damaged SD card". However if I pull the card and read it from my PC, it seems fine. I was able to copy all the contents to my PC. So what gives? Can I somehow make my phone realize the error of its ways? Or do I have to reformat the card and then copy everything back? I've got the 2.2 update. Standard Droid. Any tips?