“How to verify these are Genuine OEM SD Cards manufactured by Samsung? How to check/verify their Class (not by seeing the label)?”

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• I’ve verified that they are authentic.

  Answered by mdtechguy 6 years ago

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• If you purchased the Samsung memory at Best Buy the cards will be OEM cards. OnlIne purchases with an unknown company could get you a defective or a fake card. I purchased the Samsung Evo plus memory cards in a local Best Buy store and got exactly what I wanted (a fast and reliable 64GB SD memory card).

  Answered by Dave 6 years ago

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• the U3 on the card meant it can write at 30MB/per second - Samsung says this card reads data at speeds of 100 MB per second.If you want the class it is the website says it is class 10

  Answered by jph17 6 years ago

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