189cf1f5___Disadvantage
[RAID Level] 50 [Description] RAID 0 striping across low level RAID 5 arrays. [Advantage] Improvement on the write speeds and better fault tolerance compared to RAID 5. Allows 1 drive failure per RAID 5 in the RAID 50 array [Ideal...] Applications that require high fault tolerance and capacity [Disadvantage] 
Usable storage capacity equals total capacity of all drives in the array, less the capacity of two drives
Disadvantage