If you’re looking for a new MicroSD card for your camera, smartphone, or tablet, then it would make sense to buy the fastest and most reliable card available. Here’s what 688GBs of MicroSD storage looks like:

Here is a list of all the cards we have tested, sorted with the quickest average speeds at the top. We tested these cards using a MicroSD USB3 UHS-II card reader to get the fastest possible performance, using CrystalDiskMark.

We tested the fastest UHS-I and UHS-II cards available to us. To make the most of the high speed available with UHS-II cards, you’ll need a camera or device compatible with UHS-II cards, as well as a memory card reader that supports UHS-II. UHS-II cards can be used in UHS-I cameras and card readers, but you won’t get the benefit of the additional speed. On the left, above, you can see the extra contacts on the UHS-II card.
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https://www.ephotozine.com/article/top-10-best-microsd-memory-cards-27366