D-Link DNS-327L User Manual page 49

Section 3 - Installation
Step 29 - Under RAID Configuration, Select RAID Type, choose
RAID 0. Read the RAID 0 configuration requirements.
Click Next to continue.
Step 30 - With RAID 0, the two drives are striped into one Volume,
making it appear that you have one drive.
Map Drive to Network indicates that the NAS has separated the
drive into 2 Volumes. To explain, if the size of the two drives are
different , the spare drive space will be formatted as a JBOD volume.
It is better to have drives of the same sizes.
Click Next to continue.
DNS-327L 44
D-Link ShareCenter User Manual