Figure shows six disk drives in an array: three 240 GB drives and three 400 GB drives. The three 250 GB drives are configured into a RAID 5 array of 500 GB with 250 GB parity data. The three 400 GB drives are configured into a separate RAID 5 array with 500 GB with 250 parity data. The two RAID 5 arrays are configured into a RAID 50 array of 100 GB plus parity.