RAID
World of Warcraft
A raid is a large-scale attack on an area by a group of players.
Storage
Redundant Array of Inexpensive Disks. The term was coined in 1987 by researchers at the University of California at Berkeley to describe a series of redundant architectures used in fault-tolerant disk arrays (RAID levels 1 through 5).
Redundant Array of Independent Disks. NetApp appliances use RAID 4, which protects against disk failure by computing parity information based on the contents of all the disks in the array.