Solved! Can I initialize my HDD as MBR when I have installed my OS on SSD?

Dec 7, 2021
Hi guys,
I just got a brand new Lenovo Legion without OS.
HDD 1Terra.
After installing OS on the SSD, My HDD is not recognized in the system.
I found out that I need to initialize the HDD (Which I want to use for general storage (movies etc.)), to become recognizable for the computer.
Do I need to choose MBR as partition style? And won't this interfere with my OS on the SSD? Ore do I have to choose GPT?
I am kinda new in this :)
Thanks in advance!