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    Command:

    dosfsck

    
    
    
    

    SYNOPSIS

           dosfsck|fsck.msdos|fsck.vfat  [-aAflnrtvVwy]  [-d PATH -d ...] [-u PATH
           -u ...] DEVICE
    
    
    

    DESCRIPTION

           dosfsck verifies the consistency of MS-DOS filesystems  and  optionally
           tries to repair them.
    
           The following filesystem problems can be corrected (in this order):
    
           *   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 deleted.
    
           *   Files . and .. are non-directories. They can be deleted or renamed.
    
           *   Directories . and .. in root directory. They are deleted.
    
           *   Bad filenames. They can be renamed.
    
           *   Duplicate directory entries. They can be deleted 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 filesystem check is restarted
               after truncation.
    
           *   File's cluster chain is shorter than indicated by the size  fields.
               The file is truncated.
    
    
    

    OPTIONS

           -a  Automatically repair the filesystem. No user intervention is neces-
               sary.  Whenever  there  is more than one method to solve a problem,
               the least destructive approach is used.
    
           -A  Use Atari variation of the MS-DOS filesystem. This  is  default  if
               dosfsck  is  run on an Atari, then this option turns off Atari for-
               mat. There are some minor differences in Atari  format:  Some  boot
               sector  fields  are interpreted slightly different, and the special
               FAT entries for end-of-file and bad cluster can be different. Under
               MS-DOS  0xfff8 is used for EOF and Atari employs 0xffff by default,
               but both systems  recognize  all  values  from  0xfff8...0xffff  as
               end-of-file.  MS-DOS  uses  only  0xfff7 for bad clusters, where on
               Atari values 0xfff0...0xfff7 are for this purpose (but the standard
               value is still 0xfff7).
    
           -d  Delete  the  specified  file.  If more that one file with that name
               exists, the first one is deleted.
    
           -f  Salvage unused cluster chains to files. By default, unused clusters
               are added to the free disk space except in auto mode (-a).
    
           -l  List path names of files being processed.
    
           -n  No-operation  mode:  non-interactively  check for errors, but don't
               write anything to the filesystem.
    
           -r  Interactively repair the filesystem. 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 filesystem 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  modifica-
               tions that have to be scanned for each disk read.
    
           -w  Write changes to disk immediately.
    
           -y  Same as -a (automatically repair filesystem) for compatibility with
               other fsck tools.
    
           Note: If -a and -r are absent, the filesystem is only checked, but  not
           repaired.
               ered  data  into files named 'fsckNNNN.rec' in the top level direc-
               tory of the filesystem.
    
    
    

    BUGS

           Does not create .  and  ..  files  where  necessary.  Does  not  remove
           entirely  empty  directories.  Should  give  more  diagnostic messages.
           Undeleting files should use a more sophisticated algorithm.
    
    
    

    SEE ALSO

           dosfslabel(8)
           mkdosfs(8)
    
    
    

    HOMEPAGE

           More  information  about  dosfsck  and  dosfstools  can  be  found   at
           <http://www.daniel-baumann.ch/software/dosfstools/>.
    
    
    

    AUTHORS

           dosfstools   were   written   by   Werner   Almesberger  <werner.almes-
           berger@lrc.di.epfl.ch>, Roman Hodek  <Roman.Hodek@informatik.uni-erlan-
           gen.de>,   and   others.  The  current  maintainer  is  Daniel  Baumann
           <daniel@debian.org>.
    
    
    

    3.0.9 2010-01-31 DOSFSCK(8)

    
    
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