True. There are other issues too.

The card may have significantly less capacity than stated.

The card may be corrupted.

The card may be preloaded with software you don't want/may be harmful.

Always buy genuine data storage from a reputable trader, from a bricks and mortar store or their online shop.

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Buttercup: You mock my pain! Man in Black: Life is pain, Highness. Anyone who says differently is selling something.