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Redundant array of independent disks (RAID) is

[t]he use of multiple hard disks to store the same data in different places. By placing data on multiple disks, I/O operations can overlap in a balanced way, improving performance. Since multiple disks increase the mean time between failures (MTBF), storing data redundantly also increases fault-tolerance.[1]
a method of writing data across multiple disk drives for the purpose of data redundancy or performance improvements.[2]


  1. FFIEC IT Examination Handbook, Operations, Appendix B: Glossary (full-text).
  2. ARSC Guide to Audio Preservation, Glossary, App. B, at 228.