SanDisk MicroSD SDHC 32GB Class 10 Ultra UHS-1 (SDSDQUA-032G-U46A) - lower then 10MB/s write speed.

I’ve tested the write speed of this sd card, It was 8.5-9.2MB/s

as far as I know it must have write speed of 10MB/s atleast (Class 10).

I have different 10 Class card(not sandisk) that exceeds 10MB/s, so It is not the card reader problem.

Is my card faulty?

Thanks for your reply.