this post was submitted on 26 Jan 2025
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There's different ways to arrange data on multiple physical drives. One group of ways is called RAID. One specific type of RAID is called RAID5. And, one can have 3 or more drives in the RAID5 array.
I've 3 drives, each 2TB. In RAID5 I only get 4TB of effective storage (not 6TB). If any one of my 3 physical drives fails, the array preserves all data and continues to operate at a slower speed. The failed drive can be replaced, a rebuilding process performed, and performance restored. If a second drive fails then data is lost and the array stops working. But, even then, new drives can be purchased and data restored from backup.
In a business we never want unplanned downtime because it's costly. We'd be replace hard drives before they fail on a schedule we choose: planned downtime when no one is working. But, at home, particularly with backups, unplanned downtime often isn't very costly. We can keep using our old hardware, maximizing its value, until it fails entirely.