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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Drives fail. It’s a fact of life and there’s no way to know when each drive will fail.
If I have a hard drive at home that fails and I don’t have a backup, my data is gone forever (or be forced into spending money on an expensive recovery service, which probably won’t be 100% effective).
If I have a RAID 1 setup at home, one drive can fail, and my data is still there on the other drive. I can then replace the failed drive and the mirror is restored. I am protected again.
Another reason for RAID is to have your data spread out on multiple drives. If all of my data is spread out on 10 drives, I will probably be able to read out all of that data faster than if it was all on one single drive. The single drive becomes a bottleneck.
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