fsck.vfat(8) - phpMan

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DOSFSCK(8)                   MAINTENANCE COMMANDS                   DOSFSCK(8)



NAME
       dosfsck - check and repair MS-DOS file systems

SYNOPSIS
       dosfsck|fsck.msdos|fsck.vfat [-aAflnrtvVwy] [-d path -d ...]  [-u path -u ...]
       device

DESCRIPTION
       dosfsck verifies the consistency of MS-DOS file systems  and  optionally  tries  to
       repair them. The following file system 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 file names. 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 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  per-
       forms  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.

       -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 format. 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  any-
              thing to the filesystem.

       -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.

       -y     Same as -a (automatically repair filesystem) for  compatibility  with  other
              fsck tools.

       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.

FILES
       fsck0000.rec, fsck0001.rec, ...
              When recovering from a corrupted file system, dosfsck dumps  recovered  data
              into  files named 'fsckNNNN.rec' in the top level directory of the file sys-
              tem.

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.

AUTHORS
       Werner Almesberger <werner.almesberger AT lrc.ch> Extensions (FAT32, VFAT)  by
       and current maintainer: Roman Hodek <roman AT hodek.net>



Linux                          December 31 1997                     DOSFSCK(8)

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