What is "RAID4"?
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Summary
RAID4 is almost the same as RAID3.
It manages data by distributing it, so even if data is corrupted, it can be repaired.
However, the chunks of distributed data are larger.
Prior Knowledge
What is an HDD?
It is a box for storing computer data. It's like a toy box for putting away toys.
What is RAID?
It is a technology that combines multiple HDDs to manage data. The name changes depending on how you arrange the toy boxes.
What is RAID4?
RAID4 is a method that saves data and parity (additional data for error detection and correction) across multiple HDDs to improve data reliability.
RAID3: The unit of division is small.
Box A: Doll's left ring finger, doll's left thumb, doll's little finger
Box B: Doll's right middle finger, doll's right index finger
Box C: Data recovery data
RAID4: The unit of division is larger than in RAID3 (block unit).
Box A: Doll's left hand
Box B: Doll's right hand
Box C: Data recovery data
This allows for faster data reading.
Learn through a Short Story (SS)
Goku: "Vegeta, I've been asked to manage the Dragon Balls of other universes lately, and there are up to the 10th universe, so is there any way to handle this?"
Vegeta: "Why are you managing Dragon Balls every time? Hmph, well fine, try using RAID4. It has high data reliability."
Goku: "RAID4? What kind of mechanism is that?"
Vegeta: "Simply put, you use three warehouses to save data. One is for normal data, another is also for normal data, and the last one is for parity data, which is like insurance. Also, the chunks you save are large. You can save them in chunks like the Dragon Balls of the 1st universe, so you can take them out immediately."
Goku: "I see! With that parity data, even if one warehouse breaks, it's fine, and the Dragon Balls are easy to retrieve!!"
Vegeta: "That's right. So rest assured and save the Dragon Balls. The warehouse will probably explode again tomorrow anyway."