RAID 4: Independent Data disks with shared Parity disk
Characteristics/Advantages
1. Very high Read data transaction rate
2. Low ratio of ECC (Parity) disks to data disks means high efficiency
3. High aggregate Read transfer rate
Disadvantages
1. Quite complex controller design
2. Worst Write transaction rate and Write aggregate transfer rate
3. Difficult and inefficient data rebuild in the event of disk failure
4. Block Read transfer rate equal to that of a single disk
