D-Link DNS-320L User Manual page 83

Section 4 - Configuration
Under Physical Disk Information, you will be able to see the drive you just
installed. It provides the Slot location, Vendor, Model, Serial Number, and
disk Size. Just below this informational box is a checkbox that offers you the
option to Reconfigure to RAID 1. Click the checkbox to proceed by
migrating to RAID 1.
Click Next to continue.
Select the disk drive you would like to use to reconfigure the drive to RAID 1.
Click Next to continue.
D-Link ShareCenter DNS-320L User Manual 77