So I had problems with battery and went to the store and they said its probably because i have a my things on my phone and dont have an SD card. So I bought an 8gb SD card and put it in my phone. The guy said he was syncing all my files to it. So I left and when I got home and it was all done syncing I noticed that now half my photos are gone and way more than half my music is gone.... why did this happen and how do I fix it?