EXPLANATION
RAID 50, also called RAID 5+0, combines the straight block-level
striping of RAID 0 with the distributed parity of RAID 5. As a RAID 0
array striped across RAID 5 elements, maximum fault tolerance is 1 in each RAID 5. Then the maximum fault tolerance is 2.
SOURCE
https://en.wikipedia.org/wiki/Nested_RAID_levels
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