How many RAIDS are available for fault tolerance methods

RAID (Redundant Array of Inexpensive Drives) is the technology developed to decrease risk involved with the usage of individual disks for Storage. RAID adds realibility & provides performance in Read methods. Well Known RAID Levels are 1. RAID0 - Striping, 2. RAID1 - Mirroring, 3. RAID2 - Striping at Bit level using Error correction code on disks, 4. RAID3 - BYTE Level striping with parity disk, 5. RAID4 - Block Level striping with Dedicated parity disk, 6. RAID5 - Striping at Block level with Distributed Parity, 7. RAID6 - Block level striping with Dual Distributed Parity. All RAID levels enable Fault Tolerant storage volumes except RAID0.