What do the abbreviations A1 and A2 mean on SD cards?
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SanDisk Extreme® PRO microSDXC™ UHS-I CARD, Best Micro SD Card | Western Digital
What do the abbreviations A1 and A2 mean on SD cards?
A1 vs A2 SanDisk MicroSD Card: What's The Difference? - MyMemory Blog
What do A1 & A2 Ratings on SD and microSD Cards Mean?