The lost+found directory at the root of a filesystem is where the filesystem repair command fsck puts chunks of data that do not belong to any file.

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What is the purpose of the lost+found folder in Linux and Unix?

There is a folder at the root of Linux and Unix operating systems called /lost+found/ What is it for? Under what circumstances would I interact with it? How would I interact with it?
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File missing after fsck

Recently, my HDD crashed and I had to run a fsck command. Many files were moved to the lost+found folder and I've retrieved the important ones using find and grep, but I can't find my SQL databases. ...
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Can you have multiple lost and found directories?

I was unaware of the mklost+found command until I read this question. The mklost+found command will make a new lost+found directory in the pwd. Why would you ever need to run this command? The ...
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1answer
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Busybox NAS appliance

I have a NAS appliance that crashed last weekend. The IT guys apparently / maybe didn't recover it in the right way? There's about 50,000 directories in a "lost+found" directory each with a numeric ...