So this is very frustrating for me. I have 3 64gb micro sd cards that i bought that has been coming up as corrupted on my phone. 2 of them I bought on Amazon for $20 both sandisk, i figured since it's probably one of the fake sd cards that has to be the problem. This micro sd that I literally just bought from best buy is showing up as corrupted as well, i formatted it using the the android system rebooted my phone and the same thing occurred, i honestly didnt start having sd card problems until i updated to 6.0 I really just want to know why is this happening and is there any kind of fix to this. My last resort is to go back to katana rom and try again. If that doesn't work then I'm either getting an replacement device ir a new phone.