Cleanup Phase Messages

X files Y blocks Z free

This is an advisory message indicating that the filesystem checked contained X files using Y blocks leaving Z blocks free in the filesystem.

SUPERBLOCK MARKED DIRTY

A field in the superblock is queried by system commands to decide if fsck must be run before mounting a filesystem. If this field is not "clean," fsck reports and asks if it should be cleaned.

PRIMARY SUPERBLOCK WAS INVALID

If the primary superblock is too corrupt to use, and fsck can locate a secondary superblock, it asks to replace the primary superblock with the backup.

SECONDARY SUPERBLOCK MISSING

If there is no secondary superblock, and fsck finds space for one (after the last cylinder group), it asks to create a secondary superblock.

CHECKSUM WRONG IN SUPERBLOCK

An incorrect checksum makes a filesystem unmountable.

***** FILE SYSTEM WAS MODIFIED *****

This is an advisory message indicating that the current filesystem was modified by fsck.

***** REMOUNTING ROOT... *****

This is an advisory message indicating that fsck made changes to a mounted Root filesystem. The automatic remount ensures that in-core data structures and the filesystem are consistent.