Hi guys,*My phone shows SD card is damaged, try reformatting it. It is a transcend class 10 16 gb card. It was fine when I switched it off at night, but at morning it showed this. I tried re inserting, did not work. I was on jelly bean 4.2.1.(I9300XXUFMB3_I9300OJKFMB3_ILO).I wiped the whole thing and installed 4.1.2.(I9300XXEMB5_I9300OXAEMB5_BTU).Still the same. PC also do not recognize external sd card on connecting the phone via cable. About to try to connect via adapter. Should buy one..So guys why did this happen? I dont have any backup of my external sd card so I dont want to reformat it.