To test the speeds of the 256GB SATA M.2 SSD that ships with the ZenBook, we ran CrystalDiskMark 5.2.1.
The UX430UA’s SSD delivers decent speeds for a SATA SSD, but really we would have liked to see a NVMe SSD as these are not hideously expensive anymore and considerably quicker. The 256GB capacity is adequate, but 512GB is a more comfortable choice these days.
The UX430UA has a single USB 3.0 port, into which we plugged a 32GB SanDisk Ultra USB 3.0 thumb drive.
These results are reasonable for this thumb drive.