When it was empty, the graph showed the normal downward curve you can see on the right, for the entirety of the disk. As I’ve written it half full, the used space became this irregular graph. Can anyone explain why? It’s not supposed to matter what kind of files are there, if any, for this benchmark.
WD Elements 4TB USB3, tried different cables, host controllers, Windows 10 Pro normal and safe mode, all the same. The chart remains the same pattern when re-done.