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FSCK_MSDOS(8) System Manager's Manual FSCK_MSDOS(8)

fsck_msdos
DOS/Windows (FAT) file system consistency checker

fsck_msdos [
-fnpy
] filesystem

The fsck_msdos utility verifies and repairs FAT file systems (more commonly known as DOS file systems). It checks the specified filesystem and tries to repair all detected inconsistencies, requesting confirmation before making any changes.
If the -p flag is given, fsck_msdos preens the specified filesystem. It is normally started this way by fsck(8) run from rc(8) during automatic reboot, when a FAT file system is detected. When preening file systems, fsck_msdos will fix common inconsistencies non-interactively. If more serious problems are found, fsck_msdos does not try to fix them, indicates that it was not successful, and exits.
The options are as follows:
 
 
This option is ignored by fsck_msdos, and is present only for compatibility with programs that check other file system types for consistency, such as fsck_ffs(8).
 
 
Assume a “no” response to all questions asked by fsck_msdos except for “CONTINUE?”, which is assumed to be affirmative. The filesystem will not be opened for writing. This is the default for file systems to be checked that are concurrently mounted writable.
 
 
Preen the specified filesystem.
 
 
Causes fsck_msdos to assume “yes” as the answer to all operator questions.
If neither of the -y or -n options are specified, the user may force fsck_msdos to assume an answer of “yes” to all the remaining questions by replying to a question with a value of “F”.

fs(5), fstab(5), fsck(8), fsck_ffs(8), mount_msdos(8), newfs_msdos(8), rc(8)

fsck_msdos is still under construction.
October 14, 2015 OpenBSD-5.9