What do the abbreviations A1 and A2 mean on SD cards?
ELITE A1 U3 Card│TEAMGROUP
Kingston 32GB Canvas Select Plus microSD Memory Card - Up to 100MB/s read, UHS-I/U1/V10/A1 Compatibility, SD Adapter Included - SDCS2/32GB at TigerDirect.com
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
SanDisk Ultra 128GB MicroSD XC Class 10 A1 UHS-1 Mobile Memory Card up to 98MB/
Sandisk 64GB NEW Ultra MicroSD SDXC Card UHS-I Class10 A1 Speed up to 140MB/s | eBay