
It's not easy to estimate speed because it's dependent on both the sd-card and the smartphone. Although though the card is compatible with the UHS-1 high-speed standard, few devices actually use it. That's just pointless. As opposed to 128 GB, why 119 GB? This is because of the disparity in the units of measurement; whereas cards are typically 1 GB in size, all devices use 1024 MB, therefore the difference arises.

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