What is the storage efficiency of RAID 0 compared to other RAID levels?

RAID 0 provides the highest storage efficiency among the different RAID levels because it combines multiple disks into a single volume without any redundancy. In RAID 0, data is striped across all available disks, which means that the total storage capacity of the RAID array is equal to the sum of the capacities of all disks used. This results in 100% of the storage capacity being available for use, as there is no space reserved for parity or mirroring, unlike other RAID configurations that prioritize data redundancy or performance at the cost of usable storage.

For instance, in RAID 1 and RAID 5, some of the capacity is used to store parity information or mirrored copies of the data—leading to lower overall storage efficiency. RAID 1 duplicates data across disks, and RAID 5 requires additional space for parity calculations. Therefore, users opting for RAID 0 can utilize all their disk space effectively, making it the most efficient choice in terms of storage capacity, especially when data redundancy is not a primary concern.