![]() ĭata is distributed across the drives in one of several ways, referred to as RAID levels, depending on the required level of redundancy and performance. This was in contrast to the previous concept of highly reliable mainframe disk drives referred to as "single large expensive disk" (SLED). ![]() RAID ( / r eɪ d/ " 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. For other uses, see Raid (disambiguation). For the police unit, see RAID (French Police unit). This article is about the data storage technology.
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