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. Use this tag for questions relating to this directory and/or how it’s used by the filesystem repair process. Do not use this tag for questions about files or directories that are somehow missing from the filesystem.
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 fsck, the filesystem repair command, finds chunks of data that do not seem to belong to any file, it attaches this data to the