Aftyyy :
I don´t remember what it is called but I think you understand.
No. I can't guess that. You have to specify, what RAID solution you are using - software, hardware. If hardware RAID, then also specify hardware used - motherboard model name or RAID controller model name (if you're using RAID add-on card).
Aftyyy :
I did some more research and I figured out that I want to remove the mirror, not break it.
To do that, you need to break the mirror. Or else your mirror RAID will operate in failed/degraded mode.
Aftyyy :
P.S. if you could direct me to a link that would be great too!
Can't direct you to any link, since you did not specify anything about raid solution used.