So, as promised, I got my Nova yesterday. I did not have the chance to use 2 external drives at the same time, but using the Seagate USB 3.0 on any of the two USB 3.2 (blue) ports works well, I even tested the speed using CrystalMark and is about the same speeds I had with my previous laptop. Removing and inserting the drive a few times also had no problems at all.So, a quick update about the situation; Yes, if I disconnect everything except the HDD, it crashes. Then, my external Verbatim HDD is internally a Seagate 1To HDD, so it will likely do the same things as me. Weirdly enough, I tried one of the other HDD that was in my house, a WD elements 4To USB 3.1, and, guess what? It works!! So the problem seems to happen really ONLY for the USB 3.0 devices with high power need; all above or below USB 3.0 will be more likely to work (please, don't take my word for granted, as I may be wrong. It is just pure analysis).
Over the weekend I'll try 2 external drives at the same time and will let you know. By the way, my Seagate drive is the Expansion 1Tb (picture below):