What do the abbreviations A1 and A2 mean on SD cards?
SanDisk Extreme Micro SD Card 32GB UHS-I SDHC Class 10, 100mb/s and 66 – JG Superstore
Amazon.com: LinkMore 128GB Micro SDXC Card, A1, UHS-I, U3, V30, Class 10 Compatible, Read Speed Up to 95 MB/s,Write Speed Up to 50 MB/s, SD Adapter Included : Electronics
A2-class microSD cards offer no better performance for the Raspberry Pi | Jeff Geerling
Are high-speed/high-capacity (A1, A2, U3) microSD cards worth it for Android? With Black Friday and Cyber Monday deals coming up, I (re)tested 5 of those and 2 older ones in 3 quite
Kodak Memory Card Micro SD High Speed 100MB/s A1 Class 10 UHS-I 256GB 128GB | eBay
All about SanDisk's microSD cards with the new A1 speed class - HardwareZone.com.sg
SanDisk Extreme® microSDXC™ UHS-I CARD, 4K UHD, Full HD | Western Digital