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What (who) is RAID - definition
.JPG?width=200 "Storage servers with 24 hard disk drives each and built-in hardware RAID controllers supporting various RAID levels")
![A [[SATA 3.0]] controller that provides RAID functionality through proprietary firmware and drivers](https://commons.wikimedia.org/wiki/Special:FilePath/SATA 6 Gbit-s controller, in form of a PCI Express card.jpg?width=200 "A [[SATA 3.0]] controller that provides RAID functionality through proprietary firmware and drivers")
Wikipedia
RAID (; "redundant array of inexpensive disks" or "redundant array of independent disks") is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both. This is in contrast to the previous concept of highly reliable mainframe disk drives referred to as "single large expensive disk" (SLED).
Data is distributed across the drives in one of several ways, referred to as RAID levels, depending on the required level of redundancy and performance. The different schemes, or data distribution layouts, are named by the word "RAID" followed by a number, for example RAID 0 or RAID 1. Each scheme, or RAID level, provides a different balance among the key goals: reliability, availability, performance, and capacity. RAID levels greater than RAID 0 provide protection against unrecoverable sector read errors, as well as against failures of whole physical drives.
