Can't add external SSD on MacOS as Scratch Disk

[LAUNE]

Hey guys,

so I bought an SSD sometime and got an ICY-BOX kit to connect to via USB-C to my Macbook.

I wanted to add this external ssd as a scratch disk or "Arbeitsvolumes" (called like this in German) but its not showing up. Maybe because I've already saved my private data on this ssd?

Is there someone with a fimiliar problem?

Does my SSD have to be empty?

Thanks in advance 

[Test Screen Name]

How is it formatted?

[LAUNE]

Hi, its Formatted as ExFAT

[JohanElzenga · Accepted solution]

That is most likely the problem. I don't think that you can use disks that are not Apple (HFS+ or APFS) formatted.

[LAUNE]

alright im going to try that one out.

I will hit you guys up if that worked out.