Can't Mount USB Drive As User Under FreeBSD 10

Michael Powell nightrecon at
Fri Feb 14 05:47:36 UTC 2014

Erich Dollansky wrote:

> Hi,
> On Fri, 14 Feb 2014 04:39:46 +0000
> B J <va6bmj at> wrote:
>> I've had problems configuring the machine to mount external USB
>> drives.  I can mount USB thumb drives when logged in as root using:
>> mount -t msdosfs -o -m=644,-M=755 /dev/da0s1 /mnt/root
> this hints that just some of your access rights are wrong. Just ask a
> search engine for allowing user to mount devices.
> You need to be able to read and write to /dev/da0s1 as a user if you
> want to allow users to mount it.

These permissions are generally set in /etc/devfs.conf. Check out the man 
page for devfs.conf. In the Handbook is some more info regarding the use of 

You may need to place vfs.usermount=1 in your sysctl.conf as well. I've only 
ever used the devfs.conf in the past for very simple configs on machines 
only I control, which is probably not a very secure approach. Perhaps the 
additional devfs.rules (it has a man page too) info from the Handbook page 
is a better way to go as it seems like it has better security in mind.


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