請參考 Intel 網頁的說明：
http://www.intel.com/support/motherboards/server/sb/CS-029839.htm

Level 1E: RAID level 1E is also referred to as RAID level 1 "Enhanced". In terms of RAID, it can be thought of as enhanced mirroring or striped mirroring. The name sounds like RAID 10, but RAID 1E uses an odd number of disks to achieve data protection while RAID 10 requires the use of an even number of disks. RAID 1E strips data across all disks in the array like RAID 0. However, RAID 1E takes a copy of the data and then strips it across all of the disks as well. RAID 1E shifts the second copy of the data over on each physical disk to move the data stripe copies to other disks. Minimum number of drives is three.

Level 10E: Level 1E is enhanced mirroring, which offers the same functionality as RAID 10 on an odd number of drives, starting with three. RAID 10E is the same as RAID 1E, but on an even number of drives. Minimum number of drives is four.

簡單的說，RAID 1E 與 10E 都是提供類似於 RAID 10 的功能，只是作法上不同；而 RAID 1E 需要奇數顆硬碟，RAID 10E 則和 RAID 10 一樣需要偶數顆硬碟。

另外，這裡：http://www.bytepile.com/raid_class.php 有關於 RAID 1E 的圖解說明可供參考。