I've tested my 4TB drive with Victoria 4.73b and it shows quite a few slow sectors. Here is a picture:
The one sector around 3s is my fault as I've checked SMART status while it was testing the drive.
Should I be concerned?
The drive is for backup purposes and has around 20h of usage so far. But it's not new, made in 2016.
Now I'm testing all my HDDs...