Question about TS-451+-8G - 367263

There are 4 disk bays. I have two 3TB disks and two 4TB disks. Can I form a RAID group (RAID1) with the two 3TB disks and a second RAID group with the two 4TB disks? (also RAID1) The idea behind this would be to provision two volumes. One with 3TB and one with 4TB.