189cf1f5___Disadvantage
[RAID Level] 6 [Description] Disk striping with dual distributive parity [Advantage] Similar to RAID 5, but you can have 2 drives fail and still have access to your data. [Ideal...] Content creation applications requiring data protection [Disadvantage] 
Usable storage capacity equals total capacity of all drives in the array, less the capacity of two drives. Disk failure results in drop in performance
Disadvantage