RAID is a spectrum of technologies used to combine disks into sets for both speed and/or redundancy
RAID0 takes the data and spreads it across all drives - speed, but any failure takes out the volume. So it is less safe than a single drive.
RAID1 takes the data and writes two copies. It can survive one failure, but you lose half the capacity.
RAID10 = RAID0 + RAID1 - so you have two copies, but the individual copies are spread across multiple disks.
there are others, but less common.
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