Understanding A1 and A2 Ratings on SD Cards Explained

Learn the differences between A1 and A2 SD card ratings for optimal app performance.

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A1 and A2 on an SD card refer to Application Performance Classes set by the SD Association. A1 cards perform at least 1,500 read IOPS (Input/Output Operations Per Second) and 500 write IOPS, while A2 cards offer at least 4,000 read IOPS and 2,000 write IOPS, making them better suited for apps and multitasking.

FAQs & Answers

  1. What is the difference between A1 and A2 SD cards? A1 SD cards have a minimum performance of 1,500 read IOPS and 500 write IOPS, while A2 cards have at least 4,000 read IOPS and 2,000 write IOPS.
  2. What do the IOPS ratings mean on SD cards? IOPS stands for Input/Output Operations Per Second, indicating how many read/write operations a card can perform in one second.
  3. Which SD card should I choose for mobile apps? If you need to run apps directly from the SD card, an A2 rated card is preferable due to its higher performance.
  4. Can an A1 card suffice for regular use? Yes, an A1 card is suitable for basic app performance and multitasking, but A2 cards offer better speed for more demanding applications.