First, I use a mean well S-100F-12 (12 Volt 8.5 A)
This one I had some time and I wasn't using it.
I power the NanoPi true the 4-pin connector on the sata hat with a connector used from an old PC power supply. (All 4 wires connected)
I had some spare time this week-end and did some test with my NanoPi.
The problem seems to be more noticeable when I use midnight commander and copy files from usb to the sata hat.
It also shows up when copying fi