A window appeared on my phone saying the card is TOO SLOW to be used for internal drives. That should be U3. I uninstalled it and installed a 32GB Samsung card which I had with a U1 rating. The phone accepted it with no problem and it became part of the phone memory. I don't know if this card is defective or what but I am returning it as defective in order to get a refund from Revain.
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