189cf1f5___Disadvantage
[RAID Level] 60 [Description] RAID 0 striping across low level RAID 6 arrays. [Advantage] Allows 2 drive failures per RAID 6 in the RAID 60 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 four drives
Disadvantage