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Usb. The Official Livedrive Blog. Trident - Home. RAID. History[edit] 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.[7]Around 1988, the Thinking Machines DataVault used error correction codes (now known as RAID 2) in an array of disk drives.[8] A similar approach was used in 1970s on the IBM 3330.[9]In 1977, Norman Ken Ouchi at IBM filed a patent disclosing what was subsequently named RAID 4.[10]In 1986, Clark et al. at IBM filed a patent disclosing what was subsequently named RAID 5.[11] Standard levels[edit] A number of standard schemes have evolved.

RAID

These are called levels. Western Digital Hard Drives. Encyclopodia - the encyclopedia on your iPod.