RAID :"Redundant Array of Independent Disks (RAID)".
It protects against a disk failure.
There are many levels of RAID in the data storage industry.
The most common level, and one that is used by Teradata, is RAID-1, also called MIRRORING.
With RAID-1, each primary disk has a mirror image, or an exact copy of all its data on another disk. The contents of both disks are identical.
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