RAID 2 writes Hamming ECC (error-correcting code) recovery information to dedicated parity disks at the byte level, which requires a lot of processing power. RAID 3 is another mode that got kicked ...

The parity is computed by XOR'ing a bit from drive 1 with a bit from drive 2 and storing the result on drive 3 (to learn about XOR, see OR). After a failed drive is replaced, the RAID controller ...

whereas RAID 3 and RAID 4 are known for byte-level and block-level striping with parity respectively. RAID 2 is used for its high data accuracy, however, not used widely due to the complexity of ...

The first parity RAID topology wasn't RAID5—it was RAID3 ... equivalent group of traditional vdevs—for example, a draid1:2:0 on nine disks will perform near-equivalently to a pool of three ...