Hi All Now it is time to see if I have learned anything. 1Tb SSD and 2 x 2Tb SATA HDDs, motherboard is a UEFI board but I have never used UEFI with this board. Ubuntu desktop obviously ignored it. Using Gparted partition the SSD thus: 512MB EFI Partition /dev//sda1, formatted FAT32, primary (boot?) 8 Gb allocated to SWAP rest of the disk _*/*__dev/_sda2, primary, formatted btrfs mounted as / Partition the first HDD /dev/sdb1primary, formatted btrfs , mounted as /data Second HDD same size leave completely blank Remove the gparted disk and insert the Ubuntu Server disk commence the install Install the system and add the GUI using tasksel After the system is installed add the second HDD withtwo lines in the terminal sudo btrfs device add -f /dev/sdc1 /data sudo btrfs balance start -dconvert=raid1 -mconvert=raid1 /data Enjoy the set up. Please add any corrections. The reason I choose to use the g-parted step is because the ubuntu partitioner was difficult to use.