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RAID History Each of the five levels of RAID named in the paper were well established in the art prior to the paper's publications, for example: Around 1983, DEC began shipping subsystem mirrored RA8X disk drives (now known as RAID 1) as part of its HSC50 subsystem.Around 1988, the Thinking Machines DataVault used error correction codes (now known as RAID 2) in an array of disk drives. A similar approach was used in 1970s on the IBM 3330.In 1977, Norman Ken Ouchi at IBM filed a patent disclosing what was subsequently named RAID 4.In 1986, Clark et al. at IBM filed a patent disclosing what was subsequently named RAID 5. Standard levels A number of standard schemes have evolved. These are called levels.
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