What Is Erasure Coding and How Is It Different From RAID?
TechTarget, Sunday, June 7th, 2026
Erasure coding protects data by distributing encoded fragments across storage, offering more flexibility and fault tolerance than RAID.
This definition explains erasure coding (EC), a data protection method that breaks data into fragments, adds redundant parity blocks, and distributes them across drives so data can be reconstructed after failures. Unlike RAID's fixed configurations, EC lets organizations choose data-to-parity ratios such as 5+2 or 17+3 to match their needs.
EC delivers stronger fault tolerance, handling multiple simultaneous failures, and better storage efficiency than RAID mirroring, but it requires more processing power during writes and rebuilds. RAID stays simpler to implement with lower performance overhead, yet struggles with capacity and rebuild times on large drives. EC is increasingly adopted for cloud, object-based, and large-dataset storage where RAID becomes impractical.