So it was time for a reinstallation, time to cleanup and maybe rethink a few things. I installed Windows 10 1607 Enterprise x64.
I had my old storage space running, but wanted to add an additional disk.
I wanted to go for ReFS this time (some comparison here: http://thesolving.com/storage/refs-vs-ntfs-comparison/)
When trying to format the storage spage, it would switch to deleting storage space and show the following error: The parameter is incorrect: (0x00000057)
I recall having seen a similar error in Windows 8, the solution was then to create a registry key, to allow for formatning over non mirrored volumes, specifically for ReFS.
Funny think, it was still needed.
Add the key, reboot and retry.