New Storage Pool - No Physical Disks found

Hi all, I am trying to setup a new storage pool, I have a primary HDD (with Server 2012 installed) & a secondary HDD in the same machine and would like to use both (if possible) to start a new storage pool.

The problem is that after starting the New Storage Pool Wizard and getting to the Physical Disks section, there are no physical disks to select.

Additional info that might be of use:

• On the previous step, "Storage Pool Name", there is no Primordial Pool to select either.
• Both disks are NTFS, both allocated drive letters already.

I feel like I am missing something, all tutorials I follow seem to just have physical disks to select from so I am always getting stuck.

Any help would be appreciated.

Thanks