sentences:  However, depending with a high rate Hamming code, many spindles would operate in parallel to simultaneously transfer data so that "very high data transfer rates" are possible as for example in the DataVault where 32 data bits were transmitted simultaneously.With all hard disk drives implementing internal error correction, the complexity of an external Hamming code offered little advantage over parity so RAID 2 has been rarely implemented; it is the only original level of RAID that is not currently used.RAID 3, which is rarely used in practice, consists of byte-level striping with a dedicated parity disk.