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Chapter 4 RAID Modes and Drive Management
Chapter 4 RAID Modes and Drive
Management
Available RAID Modes
The TeraStation supports multiple types of RAID. The type of RAID arrays available for use depends on how many
drives are installed on your TeraStation.
Notes:
• If you change the RAID mode, all data on the array is deleted. This is true for every procedure in this chapter.
Always back up any important data before performing actions that affect your RAID array.
• Some arrays will allow you to change the RAID mode without losing data by adding drives. To change a RAID
mode by adding drives to the existing array, refer to the
below.
• Drive capacity is displayed in Settings in actual gigabytes. The Properties window in Windows may show GiB
instead, which will be a smaller number.
• If the TeraStation is restarted or shut down while changing the RAID mode, the message will change from
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.
• RAID 5, 6, and 10 are only available for TeraStation models that allow three or more drives to be inserted. Please
check Settings on your model before changing the RAID mode.
JBOD
This mode treats the drives inside the TeraStation as individual drives. The usable space is equal to the total capacity
of all drives on the TeraStation. If any of the drives fail, then all data on that drive will be lost.
RAID 6
A RAID 6 array is available for TeraStations with four or more drives. RAID 6 combines four or more drives into a
single array. The usable space is equal to the sum of the capacity of all drives minus the capacity of two drives. For
example, if four drives are combined into a RAID 6 array, the usable space is the sum of the capacity of two drives. If
up to two drives in the array fail, you can recover data by replacing any failed drives. If three or more drives fail, then
all data in the array will be lost.
RAID 5
A RAID 5 array is available for TeraStations with three or more drives. RAID 5 combines three or more drives into a
single array. The usable space is equal to the sum of the capacity of the drives minus the capacity of one drive. For
example, if four drives are combined into a RAID 5 array, the usable space is the sum of three drives. If one drive in
the array fails, you can recover data by replacing the failed drive. If two or more drives fail at the same time, then all
data in the array will be lost.
RAID 1
A RAID 1 array combines two or more drives into a mirrored array. The usable space is equal to the capacity of a
single drive. Identical data is written to each drive. If a drive fails, data can be recovered by replacing the failed drive.
As long as one drive in the array remains undamaged, all data in the array can be recovered.
"Managing a RAID Array Without Deleting Data"
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