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RAID 2 definition

RAID 2 stands for Redundant Array of Independent Disks. It is one of the RAID levels, however it's essentially obsolete and not commonly used in modern computing environments. Despite its technical design, RAID 2 was never popular because it’s complex and costly. With the rise of cheaper and more efficient error correction methods and R configurations (like RAID 5 and RAID 6), RAID 2 became obsolete.

See also: error correction code

RAID 2 description:

  • Bit-level striping: Unlike RAID 0, which uses block-level striping, RAID 2 stripes data at the bit level.
  • Synchronization: It uses a synchronized spinning of the disk drives, which means that each disk is in sync with the others, so they all read and write simultaneously.
  • Error Correction: RAID 2 employs Hamming code for error correction, which means it can correct single-bit errors and detect two-bit errors.
  • ECC (Error Correction Code) Disk: Alongside the data disks, RAID 2 configurations have a dedicated disk for storing ECC information.