How to test SD card speed with SD Card Test Android app
[ Ссылка ]
Important: only portable SD cards can be tested, if you formatted it as internal (adoptable) storage, you need to reformat it (do not forget to backup data before formatting).
Some devices do not support to access the SD card directly, in that case this app cannot test the SD card, sorry.
![](https://i.ytimg.com/vi/EmdkOu1WhXg/maxresdefault.jpg)