Uneven write speed USB 2.0 flash drive 32 GB perfeo?

Question

USB

Here is such nonsense. With what it can be connected. The flash drive is new. What can I present in the store to have it replaced under warranty?

And there is no such thing on the other flash drive.
Same folder and different flash drive

Answer 1

if the controllers are the same, then show the second flash drive

Answer 2

Maybe they bought such a quality that the speed is small, besides, there is nothing in it.