D-Link ShareCenter DNS-343 User Manual page 80

RAID 5:
RAID 5 provides data striping with distributed parity, which stores information that can be used to reconstruct data. A RAID 5 array will be the
size of all the combined disks capacity less the capacity of one disk, e.g. If there are 4 x 80GB disks in the array, the arrays capacity will be
240GB (3 x 80GB).
Implementing RAID 5 on the DNS-343 allows it to continue operating even if one of the disks fails.
The diagram below indicates the operation of RAID 5:
D-Link DNS-343 User Manual 80