Asus RS720-E7/RS12 - Manual (Page 150)

6-36 Chapter 6: RAID configuration
6. Confirm volume creation, than click Create Volume to continue.
This process could take a while depending on the number and size of the disks.
You can contuine using other applications during this time.
When display Volume Ceation Complete message, you can click OK to finish.
You still need to partition your new volume using Windows Disk Management
before adding any data.
When you are finished, you will see the following screen in Volumes field and you
can change related items in the Volume Properties field.