Disk utility shows my 1TB SSD as circular diagram with what seems to be 2 partitions: 930GB formatted as APFS (blue color), 70,3GB unformatted (white pizza piece).

I will now have a spare 60GB SSD that I want to put into my Windows HTPC box. The idea is I want to run OS, one game and one or two movies on the SSD and the rest is still on the 1TB drive. a ...