RAID2 uses error correction codes to fix incorrect data when read from disk. Data are stipped in bit sized chunk. A dedicated disk to containt he error correction codes.
RAID3 and RAID4 uses a dedicated parity disk and requires at least 3 disk to function. The difference is that RAID3 use byte sized chunk and RAID4 uss block sized chunk. A common way to calculate parity is using XOR.
RAID5 removed the bottleneck of the dedicated parity disk. Parity are stored in all disk in a round-robin fashion. It also requires at least 3 disks to function.
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