What Does RAID 1E Mean?

RAID 1E is a type of nested RAID level that utilizes two-way mirroring on a minimum of two disks. It is similar to RAID level 1 but extends on its capabilities by supporting more physical disks.


RAID 1E is also known as striped mirroring, enhanced mirroring and hybrid mirroring.

Techopedia Explains RAID 1E

RAID level 1E primarily combines drive mirroring and data striping capabilities within one level. The data is striped across all the drives within the array. It provides better drive redundancy and performance than RAID level 1.

RAID 1E requires a minimum of three drives to be constructed and can support up to 16 drives. RAID 1E only allows half of the capacity of the array to be used. If any of the drives fail, the read/write operations are transferred to other operational drives within the array.


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Margaret 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 IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.