Setting a multi drive unit to RAID 0 gives access to the full storage space (ie. an 8TB unit will have approximately 8TB of available space). The negative of RAID 0 is that there is no backup/redundancy of any type. If one or more drives fail, all data will be lost.
Setting the unit to RAID 1 will give two Mirrored RAID sets with a total capacity of 50%, and each set is data protected from a single drive failure.
Setting a multi drive unit to RAID 5 requires one drive for redundancy (i.e. an 8TB unit will have approximately 6TB of available space). While available space is reduced, data is protected from a single drive failure.
Setting a multiple drive unit as RAID 6 will give a two drive redundancy which will result in losing those two drives worth of capacity.
Setting the drive to RAID 10 will give two drive redundancy for a total capacity of 50%.
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