D-Link ShareCenter DNS-320L User Manual page 45

Section 3 - Installation
Step. 35. -. Under RAID. Configuration, Select. RAID.
Type, choose RAID.1. Read the RAID.1.configuration
requirements.
Click Next to continue.
Step. 36. -. With RAID 1, the drives are mirrored for
redundancy. Map.Drive.to.Network indicates that the
NAS has separated the drive into a RAID array.
Note: If the size of these two drives are different, the
spare drive space will be formatted as JBOD Volume.
Click Next to continue.
DNS-320L 39
D-Link ShareCenter™ User Manual