There will be more and more devices going to utilize Android Adoptable Storage. How do you know which micro SD memory card is fast enough for Adoptable Storage? No worry, SD Association introduces the first and most basic App Performance level, App Performance Class 1 or A1 for short on SD 5.1 to help us all. Yup, your Android devices will perform properly with SD cards that certified with A1 symbol. However, most of the memory cards in the market do not have this yet. How to determine it by ourselves then? I got a solution for that. Read on to find out…