40
RAID 5 (*1)
RAID 5 arrays are available for TeraStations with 4 or more hard drives. RAID 5 combines 3 or more drives into a single
array. The usable space is equal to the sum of the capacity of the hard drives minus the capacity of one drive. If 3 hard
drives are combined into a RAID 5 array, the usable space is the sum of 2 hard drives. If one drive in the array is damaged,
you can recover data by replacing the damaged drive. If two or more drives are damaged at the same time, your data is
lost.
RAID 51 (*2)
RAID 51 arrays are available for TeraStations with 6 or more hard drives. RAID 51 combines 6 or 8 hard drives into a single
array. In this mode, two RAID 5 arrays are combined into a RAID 1 array. The total usable space for 6 drives in a RAID 51
array is 2 x the capacity of the smallest drive. For 8 drives, the total usable capacity is 3 x the capacity of the smallest
drive.
RAID 50 (*2)
RAID 50 arrays are available for TeraStations with 6 or more hard drives. RAID 50 combines 6 or 8 drives into a single ar-
ray. In this mode, two RAID 5 arrays are combined into a RAID 0 array. The total usable space for 6 drives in a RAID 50 ar-
ray is equal to 4 x the capacity of the smallest drive. For 8 drives, the total usable space is equal to 6 x the capacity of the
smallest drive.
RAID 10 (*1)
RAID 10 arrays are available for TeraStations with 4 or more hard drives. In this mode, mirrored pairs of drives in RAID 1
arrays are combined into a RAID 0 array. The usable space is equal to the capacity of the smallest drive multiplied by the
number of hard drives ÷ 2.
RAID 1
Combines 2 or more hard drives into a mirrored array. The available space in the array is the capacity of a single drive.
Identical data is written to each drive. If a drive is damaged, data can be recovered by replacing the damaged drive. As
long as any one drive in the array remains undamaged, all data in the array can be recovered.
RAID 0
Combines 2 or more hard drives into a single array. The usable disk space is the total space of all drives used. This simple
RAID mode off ers faster performance than RAID modes that include parity. If a single drive in the array fails, then all data
in the array is lost.
Normal mode
This mode uses the hard drives inside the TeraStation as individual hard disks. It is sometimes referred to as JBOD. The
disk space you can use is the total capacity of all hard drives in the TeraStation. If any drive is damaged, then the data on
that drive is lost.
(*1) Available for TS5800D, TS5600D, TS5400D series TeraStations.
(*2) Available for TS5800D, TS5600D series TeraStations.
(*3) Available for TS5800D series TeraStations.