D-Link ShareCenter DNS-320L User Manual page 247

Section 5 - Knowledge Base
RAID 0
RAID 0 provides data striping, which spreads out
blocks of data over all the drives, but does not
provide data redundancy.
Although performance is improved, the lack of
fault tolerance means that if one drive fails, all
data in the array will be lost.
D-Link ShareCenter DNS-320L User Manual
RAID 1 RAID 1 provides mirroring over multiple disks, with the
same read/write speed of a single disk. A RAID 1 array
can only be as large as it's smallest member disk.
Because the data is stored on multiple disks,
RAID 1 provides fault tolerance and protection, in
addition to performance advantages.
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