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RAID
Redundant Array of Inexpensive Drives
RAID 0 two drives with all the data stripped accross both of them. This will require a format and reinstall and if either drive fails you are toast. It will be faster.
RAID 1 Mirrored drives, each drive is a mirror of the other, good for preventing data loss if a drive fails, slower writes, in theory faster reads.
skipping 3,4
RAID 5 3 or more drives one of which is a parity drive. Redundancy and usually increased speed. If you are going to use RAID this is the best option.
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