RAID
Redundant Array of Independant Disks - RAID is a technology to improve performance, capacity and reliability by combining hard drives together to make a single drive entity known as a logical volume. RAID can be provided by software systems such as through Microsoft Windows, Firmware based controllers which usually require the PC or servers host processor to run and have limited management and diagnostic features, to fully fledged Hardware RAID controllers which have their own BIOS code, memory and processor.