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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.

The lost+found directory at the root of a filesystem is a preallocated directory for data that is present on the filesystem, but not attached to any file. This can only happen if the filesystem is damaged due to a system crash or malfunctioning media. When , the filesystem repair command, finds chunks of data that do not seem to belong to any file, it attaches this data to the /lost+found directory.

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