What is 'RAID1'?

IT Glossary (Re)

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RAID1 is a mechanism that increases reliability by saving data in duplicate.

Summary

RAID1 is a method to ensure data safety by writing the same data to two drives (HDDs). Even if one drive breaks, the data remains on the other drive, making it highly reliable.

Prior Knowledge

What is an HDD?
An HDD is a device for storing computer data. To use an analogy, it is like a box for storing toys.

What is RAID1?

RAID1 is a mechanism where you put the same toys (data) into two toy boxes (drives).

Example:

• Put the same toys into Toy Box A and Toy Box B

• Even if Toy Box A breaks, the toys still remain in Toy Box B
  

This improves data reliability. In other words, RAID1 is a mechanism to ensure you are never told, 'Sorry, I lost the luggage you entrusted to me.' It is a reliable method.

Learn through a Short Story (SS)

Goku: 'Vegeta, I'm having trouble managing the Dragon Balls. Last time I used RAID0 to split them up, the warehouse exploded, didn't it? You told me to do that, so please help me out this time.' Vegeta: 'Hmph, then you should just put the exact same Dragon Balls into two warehouses. If one explodes, the Dragon Balls will still be in the other one, right?' Goku: 'I see! So this is how RAID1 works. That's a relief! But wait, what happens if there are two sets of Dragon Balls? Oh well, never mind!!'

A few days later

Bulma: 'Vegeta!! You're taking up too much space in the warehouse. What are those Dragon Balls doing in two warehouses? They're in the way, so move them!' Vegeta: 'Hmph, fine.'