RAID, or Redundant Array of Independent Disks, is a method of grouping multiple physical disk drives into a single logical storage unit. When data is written to the array, it's broken up and placed across multiple disks. In this way, if one disk fails, the data can be reconstructed from the remaining disks in an array. RAID has two forms of data protection, data mirroring and data striping with parity. Mirroring is a basic form of data protection that is simply data duplication. Data is stored with a copy on each drive for redundancy. This form of RAID is referred to as RAID 1 and is easy to set up and maintain, but consumes a large amount of disk space and resources.