A2-class microSD cards offer no better performance for the Raspberry Pi | Jeff Geerling
A1 VS A2 SD Card: Compare Them and Make a Wise Choice - MiniTool Partition Wizard
Application Performance Class | SD Association
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What do the abbreviations A1 and A2 mean on SD cards?
Silicon Power 64GB-1TB Superior UHS-1(U3) V30 A1 MicroSD Memory Card w – SP Silicon Power
High-Performance microSD V60 UHS-II memory cards for drones and action cameras | Angelbird