Micro SD XC Issues - Can't Read Video Files

you can also test the cards yourself. there is a program called H2TestW (google search for it) that can show you if you have a fake card. the program will write to the entire card then go back and verify the data. if the card is fake you will see the verification fail at some point. typically the fake cards have some amount of storage probably like around 8GB but the partition is spoofed to make it look bigger. of course any data written past the actual capacity of available storage will become corrupt. you ill see that in H2TestW as verification failures.