fsck_dosfs(1M)

fsck_dosfs -- check and repair dosfs filesystems

Synopsis

fsck [-F dosfs] [generic_options] [-m] [-y | -n] special

Description

generic_options are options supported by the generic fsck command.

dosfs-specific options

-F dosfs

Specify the dosfs FSType. If -F dosfs is not specified heuristics similiar to those used by fstyp(1M) are used to determine the file system type.

NOTE: This command executes faster if it is not required to autodetect file system types. If possible, specify -F dosfs.

-y

Assume a yes response to all questions asked by fsck.

-n

Assume a no response to all questions asked by fsck.

-m

Sanity checking only.

The dosfs-specific fsck command checks that the File Allocation Tables (FATs) are readable. At least one FAT must be readable for fsck to proceed.

The dosfs-specific fsck command checks for the following inconsistencies:

Backup copies of the FAT are not in sync with the first copy of the FAT.
Allocation units (clusters) claimed by more than one directory entry.
Lost clusters (that is, clusters not claimed by any directory entry but still marked ``in use'' in the FAT).
Directory entries pointing to cluster numbers out of range.
FAT entries in the FAT pointing to cluster numbers out of range.
Start cluster number of ``..'' not matching start cluster number of parent directory.
Start cluster number of ``.'' not matching start cluster number of current directory.
For directories, file size not being set correctly to zero.
For regular files, file size set to an incorrect byte count.
For long name entries:
- check that the sequence numbers of the entries are in order
- check that the checksum of all entries are the same
- check that there is an alias entry with the same checksum

References

generic fsck(1M), fstyp(1M)