D-Link DNS-1100-04 Product Manual page 111

Appendix A - What Is RAID?
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.minus.the.capacity.of.one.disk,.e.g..If.there.are.4x.80GB.disks.in.the.array,.
the.arrays.capacity.will.be.240GB.(3x80GB).
Implementing.RAID.5.to.the.ShareCenter®.Pro.allows.it.to.continue.operating.even.if.one.of.the.disks.fails.
The.diagram.below.indicates.the.operation.of.RAID.5:
D-Link ShareCenter Pro 1100 User Manual 108