Lexar just announced "the world's largest A2 microSD card". No, it's still a 512GB card, but what sets it apart from the previous cards with this capacity is the A2 rating. It stands for Application Performance Class 2. This card is optimized for moving apps and games out of the phone's internal storage and onto the card. In such cases the Input/Output Operations per Second (IOPS) matter much more than sequential reads and writes. The A2 rating guarantees 4000 IOPS for reads and 2000 IOPS for writes, up from 1500/500 for an A1 card. But this new card from Lexar is good for video...
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