RAID stands for Redundant Array of Independent Disks. It is used for performance, availability and security reasons. Different virtual and physical storage devices can be combined into logical RAID arrays in different configuration levels (like RAID 0 is striping and RAID 1 is mirroring). The array looks like a single device on the computer. RAID is useful when we want to handle a large amount of data. It enhances speed and increases our storage capacity. The possible data loss because of disk failure is mitigated by adding parity disks to our configuration.
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