I have a 16gb sd card full of pictures & music, I noticed out of the blue half my pictures and songs were gone on my phone yesterday, I realized the Sd card was showing it wasn't mounted. I tried to mount it & no luck. I used a new 64gb card I had just bought & have had no problem with the new one mounting. My computer will not read the 16gb sd card either. I have so many special pictures of my grandson on there & highly upset. I had bought a new sd card because I was almost out of space on the old one. It going out like it did out of nowhere does that mean its damaged? I have a samsung galaxy 5. Was wondering if anyone knew of any other tips that I haven't tried? I tried cleaning head with q tip & alcohol. I tried mounting many times, resetting the phone. I tried putting it in adapter & bringing it up on my computer. Nothing seems to be working. How do the cards get damaged if you never take them out? Thank you