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fsckwas required, and it mentioned finding files and linking them inlost+found. In 20 years with various filesystems, I've only seen this once. And that was before journalling was the norm.lost+founddirectory is created whenever you create an ext4 filesystem (as with many other filesystems), whether it's done as part of the system installation or not. “Format your HDD” is just one case of that. Whatfsckdoes is to possibly add files there.