What is a unique feature of RAID 10?

A unique feature of RAID 10, also known as RAID 1+0, is that it combines the concepts of striping and mirroring. This means that in a RAID 10 configuration, data is first divided into blocks and distributed, or "striped," across a set of drives. For every set of striped drives, the data is then mirrored to an additional set of drives. This design provides both improved performance due to the striping and redundancy due to the mirroring, allowing the system to continue functioning even if one drive from each mirrored pair fails. Thus, the answer accurately reflects the dual-layered functionality of data distribution and protection inherent in RAID 10 setups.

In contrast, the only mirroring option does not capture the full capability of RAID 10, which includes striping. Requiring a minimum of three drives does not apply since RAID 10 actually requires at least four drives for its striping and mirroring configurations. Finally, regarding fault tolerance, RAID 10 does indeed provide fault tolerance, allowing for failures in some drives without data loss, which is contrary to the statement provided in one of the other options.