Introduction
Micro SD cards have become indispensable tools for smartphones, gaming consoles, action cameras, drones, and more . Over the years, manufacturers have optimized their performance, including the introduction of A1 and A2 ratings , which define their efficiency for storing and running applications.
If you're looking for a fast memory card to improve your smartphone's responsiveness, load your games faster on Nintendo Switch, or optimize video recording , it's essential to understand the differences between A1 and A2 Micro SD cards .
In this article, we'll explain what these performance classes mean, their differences, and why an A2 card like the Xiaomi PRO Plus is an optimal choice in 2025.
What do A1 and A2 classes mean for Micro SD cards?
The A1 and A2 (Application Performance Class) classifications were defined by the SD Association to measure a Micro SD card's ability to launch and run applications smoothly on a smartphone, tablet, or other devices.
A Micro SD card must meet two key criteria to be classified A1 or A2 :
- Minimum random read and write throughput (measured in IOPS – Input/Output Operations Per Second)
- A minimum sequential throughput to ensure fast file transfers
These two criteria are crucial to avoid slowdowns, excessive loading times and crashes of applications stored on the Micro SD card.
What are the differences between an A1 and A2 Micro SD card?
The A1 and A2 cards have different performance characteristics, particularly in terms of file access speed and application execution. Here's a detailed comparison:
1️⃣ Input/Output Speed (IOPS – Input/Output Operations Per Second)
- A1 : Minimum 1500 IOPS reading and 500 IOPS writing
- A2 : Minimum 4000 IOPS reading and 2000 IOPS writing
💡 An A2 card is therefore almost 3 times faster in reading and 4 times faster in writing than an A1 card . This means that applications stored on an A2 Micro SD launch and run much faster than with an A1.
2️⃣ Minimum Sequential Speed
- A1 and A2 : Minimum sequential write speed of 10 MB/s (corresponding to Class 10 or U1)
💡 The main difference between an A1 and A2 card is therefore not in the sequential speed , but in the ability to handle a large number of simultaneous operations (multitasking, fast opening of applications, cache management).
3️⃣ Advanced data management technology
A2 cards incorporate additional technologies to optimize their performance:
✔ Caching Command : Reduces latency and optimizes file management.
✔ Improved input/output management : Accelerates the launch and smooth operation of mobile applications.
✔ Better adaptation to new operating systems : Compatible with Android Adoptable Storage and other recent technologies.
💡 A2 cards are designed for more powerful devices and more demanding uses .
Which Micro SD card should you choose depending on your use?
The choice between A1 and A2 depends on your specific need .
✔ If you use your SD card for traditional storage (videos, photos, music), an A1 card may be sufficient .
✔ If you install apps on your SD card, use your smartphone as a quick workspace, or play on a handheld console, an A2 card is a much better choice .
Why choose Xiaomi PRO Plus A2 Micro SD Card?
If you are looking for a fast, reliable and high-performance Micro SD card, the Xiaomi PRO Plus Micro SD Card is a great option in 2025.
✔ Rated A2 , it offers optimal performance to run applications and games without slowdowns.
✔ Ultra-fast read speed up to 160 MB/s for instant file access and fast game loading.
✔ Write speed up to 120 MB/s , perfect for 4K video recording and large file storage.
✔ Compatible with Nintendo Switch, Steam Deck, smartphones, drones and 4K cameras .
✔ Exceptional reliability and durability with resistance to shock, water and extreme temperatures.
Conclusion: Micro SD A1 or A2, which one to choose?
If you have basic use for your SD card (storing videos, photos and files), an A1 card may be sufficient .
If you're looking for a smooth and fast experience on your smartphone, tablet, or gaming console , an A2 card is a much better choice thanks to its much higher access speeds.
The Xiaomi PRO Plus A2 Micro SD Card is an excellent option for demanding users who want speed, fluidity and maximum compatibility with all their devices.
Discover the Xiaomi PRO Plus Micro SD Card now on Retroxmania and boost your performance!