RAID stands for R edundant A rray of I nexpensive D isks.
RAID is a method of combining several hard drives into one unit.
It can offer fault tolerance and higher throughput levels than a single hard drive or group of independent hard drives. RAID provides real-time data recovery when a hard drive fails, increasing system uptime and network availability while protecting against loss of data. Multiple drives working together also increase system performance. All RAID functions are handled by the host CPU which can severely tax its ability to perform other computations. Connectivity benefits of standard SCSI card.