DOSFSCK

NAME

SYNOPSIS

DESCRIPTION

-

FAT contains invalid cluster numbers. Cluster is changed to EOF.

-

File's cluster chain contains a loop. The loop is broken.

-

Bad clusters (read errors). The clusters are marked bad and they are removed from files owning them. This check is optional.

-

Directories with a large number of bad entries (probably corrupt). The directory can be dropped.

-

Files . and .. are non-directories. They can be dropped or renamed.

-

Directories . and .. in root directory. They are dropped.

-

Bad file names. They can be renamed.

-

Duplicate directory entries. They can be dropped or renamed.

-

Directories with non-zero size field. Size is set to zero.

-

Directory . does not point to parent directory. The start pointer is adjusted.

-

Directory .. does not point to parent of parent directory. The start pointer is adjusted.

-

Start cluster number of a file is invalid. The file is truncated.

-

File contains bad or free clusters. The file is truncated.

-

File's cluster chain is longer than indicated by the size fields. The file is truncated.

-

Two or more files share the same cluster(s). All but one of the files are truncated. If the file being truncated is a directory file that has already been read, the file system check is restarted after truncation.

-

File's cluster chain is shorter than indicated by the size fields. The file is truncated.

-

Clusters are marked as used but are not owned by a file. They are marked as free.

Additionally, the following problems are detected, but not repaired:

-

Invalid parameters in boot sector.

-

Absence of . and .. entries in non-root directories

When dosfsck checks a file system, it accumulates all changes in memory and performs them only after all checks are complete. This can be disabled with the -w option.  

OPTIONS

-a

Automatically repair the file system. No user intervention is necessary. Whenever there is more than one method to solve a problem, the least destructive approach is used.

-d

Drop the specified file. If more that one file with that name exists, the first one is dropped.

-f

Salvage unused cluster chains to files. By default, unused clusters are added to the free disk space.

-l

List path names of files being processed.

-r

Interactively repair the file system. The user is asked for advice whenever there is more than one approach to fix an inconsistency.

-t

Mark unreadable clusters as bad.

-u

Try to undelete the specified file. dosfsck tries to allocate a chain of contiguous unallocated clusters beginning with the start cluster of the undeleted file.

-v

Verbose mode. Generates slightly more output.

-V

Perform a verification pass. The file system check is repeated after the first run. The second pass should never report any fixable errors. It may take considerably longer than the first pass, because the first pass may have generated long list of modifications that have to be scanned for each disk read.

-w

Write changes to disk immediately.

If -a and -r are absent, the file system is only checked, but not repaired.  

EXIT STATUS

0

No recoverable errors have been detected.

1

Recoverable errors have been detected or dosfsck has discovered an internal inconsistency.

2

Usage error. dosfsck did not access the file system.

BUGS

AUTHOR

Index

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

EXIT STATUS

BUGS

AUTHOR