i have a few sd cards and they just will not work. i have tried all i know and also all i found so far online. they will not work in the phones or the chromebooks or the pc laptops. i have tried on the pc using the command window to see them and nothing. there must be a say to see them and if i can see them i may be able to bring them back to capacity. anyone had any lock getting dead sd cards back to life? thanks