sentences:  This spreads I/O across all drives, including the spare, thus reducing the load on each drive, increasing performance.It does, however, prevent sharing the spare drive among multiple arrays, which is occasionally desirable.Intel Matrix RAID (a feature of Intel Rapid Storage Technology) is a feature (not a RAID level) present in the ICH6R and subsequent Southbridge chipsets from Intel, accessible and configurable via the RAID BIOS setup utility.