The card is inserted into a USB 3.0 adapter: it can be seen that the sequential read and write performance is consistent with what is advertised respectively: 77.8 MB: s write 94.5 MB / s read In Random performance is by far below cons but not surprising and the files are small more performance drops (up to 0.8 MB / s write and 7 MB / s read) with lots of 4 KB. But that does not really match an expected use to record video or audio. In conclusion it's a good card.