04-16-2014
This has been covered many times before.
Basically, what you are describing is what happens when someone removes a file that a process still has open. At some time in the past did you look for and remove a few large files? If so, did you kill off the processes that were reading from or writing to those files before you removed them?
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LEARN ABOUT FREEBSD
msdos
MSDOSFS(5) BSD File Formats Manual MSDOSFS(5)
NAME
msdosfs -- MS-DOS file system
SYNOPSIS
options MSDOSFS
DESCRIPTION
The msdosfs driver will permit the FreeBSD kernel to read and write MS-DOS based file systems.
The most common usage follows:
mount -t msdosfs /dev/ada0sN /mnt
where N is the partition number and /mnt is a mount point. Some users tend to create a /dos directory for msdosfs mount points. This helps
to keep better track of the file system, and make it more easily accessible.
It is possible to define an entry in /etc/fstab that looks similar to:
/dev/ada0sN /dos msdosfs rw 0 0
This will mount an MS-DOS based partition at the /dos mount point during system boot. Using /mnt as a permanent mount point is not advised
as its intention has always been to be a temporary mount point for floppy and ZIP disks. See hier(7) for more information on FreeBSD direc-
tory layout.
SEE ALSO
mount(2), unmount(2), mount(8), mount_msdosfs(8), umount(8)
AUTHORS
This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>.
BSD
October 1, 2013 BSD