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Chapter 4 Managing Storage
RAID Modes
TeraStations support many types of RAID. The type of RAID arrays available for use depends on how many drives are
installed in 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.
• Hard drive capacity is shown in Settings in actual gigabytes. The Properties window in Windows may show GiB
instead, which will be a smaller number.
• After the RAID mode is changed (except when creating a RAID 0 array or JBOD), the TeraStation performs a RAID
check that will take about 10 hours per TB. File transfers are slower during this period. While the I17 message is
displayed in NAS Navigator2, do not turn off the TeraStation. If you do, the RAID check will start over.
• If the TeraStation is restarted or shut down while changing the RAID mode, the message displayed in NAS
Navigator2 changes from I46 or I47 to I18.
• RAID 5, 6, and 10 are only available for models with 4 drives.
RAID 6
RAID 6 arrays are available for TeraStations with 4 or more hard drives. RAID 6 combines 4 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 4 drives are combined into a RAID 6 array, the usable space is the sum of the capacity of 2 drives. If 2
drives in the array are damaged, you can recover data by replacing them. If 3 or more drives are damaged, your data
is lost.
RAID 5
RAID 5 arrays are available for TeraStations with 3 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.
For example, if 4 drives are combined into a RAID 5 array, the usable space is the sum of 3 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 10
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 divided by 2.
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