What is RAID? Redundant Array of Inexpensive (or Independant) Drives.
Why have a RAID system? Protection of your data from a hard drive failure (except in the case of RAID 0 where all the data will be lost during a hard drive failure) and higher performance exchange of data.
How does a RAID work? As the acronym RAID implies, 3 or more drives (2 or more in the case of RAID levels 0 and 1) work together as one big drive. The key to protecting data is to store parity (or backup if you will) data so that if a hard drive fails, the remaining drives will have data that was also on the failed drive. (see RAID levels for more details)
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