RAID 5 consists of block-level striping with the parity information being distributed among the drives. It requires that all drives but one be present to operate.
RAID 5 requires at least 3 drives to implement.
Characteristics & Advantages
Highest Read data transfer rate
Somewhat slower Write data transfer rate
Upon failure of a single drive, subsequent reads can be calculated from the distributed parity; such that no data is lost.
Excellent security and decent performance
Controller design is most complex
Drive failures has an effect on throughput, which is still acceptable
Rebuilding in the event of disk failure is difficult