An administrator is building a new mission-critical server. In the past, this server has gone down when two drives have failed at the same time. The administrator wants to prevent this from…

RAID 0 is pure striping with zero redundancy, meaning even a single drive failure causes complete and unrecoverable data loss.

RAID 5 uses only single distributed parity, tolerating exactly one drive failure - a second simultaneous failure destroys the array.

RAID 6 writes two independent parity blocks across all drives in the array, enabling recovery from any two simultaneous drive failures without data loss. This directly addresses the stated problem where two concurrent failures previously caused downtime. RAID 5 and other types cannot provide this same two-fault tolerance level.

RAID 10 can tolerate multiple failures only when each failed drive belongs to a different mirrored pair - two drives failing within the same mirror simultaneously still results in data loss.