OWC ThunderBay 4 Raid 5 Edition 4-Bay Professional-Grade Enclosure User configurable in RAID 0, 1, 4, 5 & 1+0 Up to 580MB/s read / 569MB/s write RAID 5 performance Up to 878MB/s read / 924MB/s write RAID 0 performance Exponentially faster rebuild times than hardware RAID Intelligent drive monitoring with desktop & email notification