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What is RAID? RAID (Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical hard disks into a single logical unit to improve data reliability or enhance input/output performance. It was first proposed in the 1988 paper “A Case for Redundant Arrays of Inexpensive Disks” by David Patterson, Garth A. Gibson, and Randy Katz at the University of California, Berkeley. At the time, it stood for “Inexpensive Disks,” but the meaning later changed to “Independent Disks.” The technology originated from the goal of achieving both cost efficiency and reliability by combining multiple small disks instead of using a single large-capacity disk. ...