-a  Automatically  repair  the filesystem. 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 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 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.