A further development of Redundant Array of Independent Disks (RAID) Level 5. RAID Level 6 protects against simultaneous failure of two member disk drives by using two independent error correction schemes. Although RAID Level 6 provides ultra-high data reliability, its write penalty is even more severe than that of RAID Level 5 because redundant information must be generated and written twice for each application update. As with RAID Level 4 and RAID Level 5, the write penalty in RAID Level 6 is often mitigated by other storage technologies, such as caching.