fsck.exfat(8) System Manager's Manual fsck.exfat(8)
NAME
fsck.exfat - check an exFAT filesystem
SYNOPSIS
fsck.exfat [ -a ] [ -n ] [ -r ] [ -v ] [ -y ] [ -b ] [ -v ] device
fsck.exfat -V
DESCRIPTION
fsck.exfat checks an exFAT filesystem and repairs the filesystem depend-
ing on the options passed. The following corruptions can be repaired,
and see the option, '-s'.
- Boot sector has invalid parameters. If backup boot sector is
valid, replace the boot sector with it.
- Cluster is marked as free but belonged to a file, or vise versa.
The bitmap for the cluster is marked properly.
- File size is abnormally large considering the count of clusters.
The size is changed.
- File size is abnormally small considering the count of clusters.
The remaining clusters are deleted.
- File's cluster chain has an invalid cluster number. The number
are changed to EOF, and the file size is also changed.
- File's cluster chain contains a loop. The loop is broken.
- Files share the same cluster. Cluster chains for files except
one are broken.
- Start cluster number is invalid. The cluster number and file size
are changed to 0.
- Checksum value of directory entry set is invalid. Directory entry
set is deleted.
- Bad hash value of a file name. The hash value is changed prop-
erly.
- Fields of directory entry set have invalid values. Directory en-
try set is deleted.
OPTIONS
-a This option does the same thing as the -p option. It is pro-
vided for backwards compatibility only; it is suggested that
people use -p option whenever possible.
-n Check the filesystem but do not attempt to repair the filesystem.
-p Repair the filesystem without user interaction if it can be done
safely.
-r Repair the filesystem interactively.
-s Create files in /LOST+FOUND for orphan clusters. These files have
clusters allocated but not belonged to any files when reparing
the filesystem. clusters unused and contiguous in bitmap are al-
located to the same file.
-v Prints verbose debugging information while checking the exFAT
filesystem.
-V Prints the version number and exits.
-y Repair the filesystem answering yes to all questions.
-b Try to repair the filesystem even if the exFAT filesystem is not
found.
EXAMPLES
repair a corrupted device and create files in /LOST+FOUND, which have
clusters allocated but not belonged to any files when reparing the de-
vice.
$ fsck.exfat -p -s /dev/sda1
SEE ALSO
fsck(8), fstab(5),
fsck.exfat(8)
Generated by dwww version 1.16 on Sat Oct 3 06:00:04 CEST 2026.