I've now tried with a couple of different disks, even formatted the smaller (600GB) one to Ext4 but still the same problem. Also tried plugging into the USB 2 port rather than the USB 3 - no difference.
Looks like I'll be sticking with the RPi3 setup.
Hi,
Did you tried another format type or only NTFS and Ext4?
I'm not an expert in this matter, but I think is used a write buffer for disk write. Maybe that buffer sometimes didn't written to the disk correctly (power issue or another bug?).
As I had issues with NTFS partitions in my PC under Linux (dual boot: W11 & Xubuntu for Android build environment), I'm using an ExFAT partition for data what I want to be accessible in the both OS. I you have some spare small disks, maybe is worth to try it.
That "advancedsettings.xml" options are valid for the disk write buffer too, or is possible to be disabled in other way?