HTC One M9‎

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When formatting my storage card for use as internal storage, I see a message saying the card is slow. Why is that?

In phones with Android 6 or later, you can allow and use a storage card to extend the internal storage. Some storage cards might have performance issues when being used to extend internal storage. It's recommended to use an Ultra High Speed (UHS) Class 3 storage card for best results.
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