Why does the mark on the memory card show A2 level but the actual test performance doesn’t reach that level?

Category : Specification / Capacity / Performance
App Performance ClassMinimum Sustained Sequential WriteMinimum Random ReadMinimum Random Write 
 Class 1 (A1)10 MB/s1500 IOPS500 IOPS
 Class 2 (A2)10 MB/s4000 IOPS2000 IOPS
The performance test will be affected by the card reader and the platform, so make sure that the card reader and platform can support this performance level before testing

The card readers currently on the market do not support the performance of A2 level, so the results will not meet the standard.
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