When on my way home from work yesterday, i heard my phone reset itself. When I picked it up to look at it, the sd card icon in the notification bar had an exlamation mark on it. So when i got home, I tried to look at it on my computer, but when I go to click on it, it says "please insert disk". Also, on the phone it says " sd blank or has unsupported filesystem". And in sttings menu, it says "total space- unavailable", "available space- unavailable". The "unmount sd card" is grayed out and it won't let me reformat it. Any idea what could be the problem? Thanks in advance.