What Does RAID 01 Mean?

RAID 01 is a type of nested RAID level that provides data sharing and replicating capabilities from a single RAID level.


It provides mirroring capabilities on RAID 0 arrays or mirrored stripe sets with enhanced fault tolerance capabilities.

RAID 01 is also known as RAID 0+1.

Techopedia Explains RAID 01

RAID 01 is similar to RAID level 1 and utilizes half of the disk capacity to mirror the data (stored in other half). RAID 01 primarily mirrors data of the stripes. It stripes multiple disks together into sets that are mirrored together. RAID 01 provides good fault tolerance capabilities where loss of one drive does not affect its operations. However, if one drive from each disk is lost, the RAID 01 ceases to function.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…