Number of failed disks allowed by RAID 2.0+

The number of failed disks allowed by RAID 2.0+ depends on the RAID level.
RAID 3 and RAID 5 only allow one disk to fail.
RAID 6 and RAID 50 only allow two disks to fail.
RAID 10 only allows N disks to fail (RAID 10 is composed of 2 x N disks).

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