@fabianlucchi Indeed. Very happy with the write speeds per disk. Almost identical to the #HAT5300 ent disk. The read is slower, as expected but for 5400rpm drives, very good imho.

If you want to have a look how HAT5300 and EXOS did in an SA3400 that I did a few years back, take a look here:

https://www.blackvoid.club/synology-sa3400-part-1-installation-and-configuration/