What determines whether you should use a Sandisk A1 or A2 micro SD card for more storage on Android phones? Is the A1 better if not storing photos/videos? - Quora
A1 vs A2 SanDisk MicroSD Card: What's The Difference? - MyMemory Blog
A1 vs A2 SanDisk MicroSD Card: What's The Difference? - MyMemory Blog
Comprar microSD - tipos, formatos, clases, velocidades y precios
Explicación de las convenciones de nomenclatura y etiquetas de tarjetas SD y microSD - Kingston Technology