Can you try something? Create a volume, then time how long it takes (to get the error message)? Are these connected to a USB hub? Here is anot...

Hi, As I posted in my last post. That also doesn't work! Using disk utility to make normal single non raid drives works 100%!!

Hi! Thank you for your reply. It takes 10,9 seconds. The HDDs are in an 8-bay case. No hub, direct USB 3.0. I also tried: Any other type of ...