Seagate NAS OS 4 Manuel D'utilisation page 109

Green: Disk capacity that spans beyond the level of RAID. This space is reserved for expansion should
you add new or, larger capacity hard drives.
Factors that determine the storage capacities for data, protection, and expansion:
The amount of hard drives in the enclosure.
The storage capacity of each hard drive (see note below on mixed capacities).
RAID mode
Single-disk or double-disk security
Examples:
RAID 0 with five hard drives. The only color is dark blue for data capacity since RAID 0 has no protection.
SimplyRAID with two hard drives of equal capacity. Dark and light blue for data and protection,
respectively.
RAID 6 with five hard drives of mixed capacities. All colors are represented since the RAID 6 uses
double-disk security and the hard drives are of mixed capacities.
Volume list and dynamic photo
Review the hard drives' capacities and status. The dynamic photo of the NAS highlights:
The hard drives associated with the volume.
Hard drives available for a new or existing volume.
Empty slots available for expansion.
Failed or missing disks.
Seagate NAS OS 4 6/1/20 110