So both SD cards were formatted in the phone under kitkat 4.4.2. I copied the entire card to HDD (computer), put in the new card (samsung EVO 32) formatted it and copied the card back from the HDD to the new one (merging the two folders made by the format). I have all pics, music, contacts, videos, but many apps (mostly games i think, but other games work fine don't know if they use SD) just have the gray android SD icon and won't launch. Where did I go wrong? I know I can just reinstall them, but I was gonna root first before i did that. you have to reinstall everything after root anyway right? Anyway I still have both the original card (ADATA 8gb, used in a few phones) which didn't work right in the s4, until i did this same process and formatted it in the S4) and the backup on the computer. Cards don't read right unless they are being read from inside the s4, but i'm guessing that universal.