If you are having issues formatting the presented tRAID disks, it is likely because you have either TCQ or SWO enabled. These RAID optimizations must be disabled before formatting tRAID disks.
So, stop the array, disable both TCQ and SWO, and restart the array. You should then be able to format the desired tRAID disk as needed. After formatting, you can then stop the array again and re-apply your desired RAID optimization settings.