RAID: Level 2

RAID 2 is an uncommon configuration that utilizes bit-level striping in conjunction with dedicated disks for storing error correction codes (ECC). Since it requires multiple dedicated disks for ECC, it provides high fault tolerance but offers minimal storage efficiency.

This level ensures data reliability by detecting and correcting errors during reads, although its complexity often outweighs its benefits in modern applications.

Unlike other levels, RAID 2 relies on synchronized spinning disks, which increases its hardware requirements and costs.

Although its error-correcting capabilities were revolutionary at the time of its invention, advancements in disk technology have rendered this level largely obsolete.

RAID 2 was historically significant for scientific and industrial applications, where data accuracy was prioritized over cost or simplicity. However, due to its limited practicality, nowadays it has been largely replaced by more efficient configurations.