I've had my S4 since it was available from verizon. I put a sandisk 32gb from a droid x2 into the GS4 when I first got it. The 32gb was almost maxed out, but never had any problems for several months at first with the S4. Then it started getting too fool, so I started deleting older files I no longer needed. When I was consolidating my files on the S4 My Files App, the whole phone froze and my card said it was unreadble, it said I needed to reformat it and it was destroyed. I hooked up the micro sd card to the computer and was unable to format it, it wouldnt read on my computer. It was in Raw mode. I tried several formating and data recovery programs. I was able to get a distorted picture and one song. But for the life of me could not format it. Dont tell me how to format a card, it wont work bottom line ive tried everything. Then I bought a 64gb sandisk class 10, I used it in my phone for 3 days, then after a download, it said my Sd card was blank just like last time. It told me to format my card and it was un able to read it. I couldnt format this one either on the computer. Then I bought a samsung sd card class 10. Thinking my problems would be over, it checked out like it was working at first, then I went to take a picture and it wouldnt save to the Sd card. I had just opened the package and put the card in, why wouldnt it work ? I went to My files> sd card> then I saw a bunch of foriegn text with symbols, so I backed out to the home page and BOOM my sd card got destroyed agian and Its not readable. Ive checked my sd cards out on other devices, they work until paired up with my s4. I thought the best sd card to get for the s4 is a Samsung class 10. But ive had no luck. I need at least 32gb for an external storage. What should I try next?