Working on my COMPTIA A+ Cert. and I came across this topic. While I understand how it works, I don’t understand why you would use it over individual drives?
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Redundancy and performance.
For example: instead of having just one hard drive, you have two identical drives which contain the same exact data. This is called RAID 1.
This has two advantages: First, there’s always a backup – if one of the drives dies, you just replace it with a new one and copy the data from the working drive. Secondly, you can read twice as fast, by reading half the data you need from each drive.
Other RAID configurations provide even better performance and better options for redundancy, usually by using more than two drives.
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