Definition of RAID

(Redundant Array of Inexpensive Disks; pr. ‘raid’) A way of connecting multiple hard disks together so that a computer sees them as one very large, very fast disk instead of many smaller ones, or to add redundancy so that if any disk in the array is physically damaged, the others have a copy of all the data and nothing is lost. Often called a ‘RAID array’, even though the acronym already contains the word array. Mostly used on network servers.