RAID 01, also called "A Mirror of Stripes", is not one of the original RAID levels. Two RAID 0 stripes are created, and a RAID 1 mirror is created over them. This is used for both replicating, and sharing data among disks.

RAID Number List
RAID 0 | RAID 1 | RAID 2 | RAID 3 | RAID 4 | RAID 5 | RAID 6 | RAID 0+1 | RAID 1+0 | RAID 7 | RAID S | JBOD

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