Htc One M8 sd card erasing

[kelvin emmett]

If I turn my phone off or the battery runs flat all the data such as apps music and videos saved on the sd card is erased and the memory card is not recognised. I then have to format and mount again. Any ideas if there is a fix for this or is the phone faulty?

 

[Almeuit]

Try another SD card.. That one could be messed up. If another one does that then it may be the phone.