From owner-freebsd-questions@freebsd.org  Thu Jan 19 22:14:39 2017
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Date: Thu, 19 Jan 2017 15:14:38 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: Re: Unable to change ownership on USB device
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On Thu, 19 Jan 2017, Gerard Seibert wrote:

> On Thu, 19 Jan 2017 16:42:26 -0500, Lowell Gilbert stated:
>
>> carmel_ny writes:
>>
>>> I have several USB devices, all formatted with FAT32 or exFat. I can
>>> mount them on my FreeBSD 11 machine; however, I cannot change the
>>> file ownership on the device. I have a rsync script for backing up
>>> the "/var/mail/vmail" and it subdirectories that are created by
>>> dovecot. I cannot use the script to back up to the USB drive since
>>> it cannot change the file ownership.
>>>
>>> I hope I am explaining this correctly. My question is how do I
>>> change the ownership of a mounted USB drive formated with FAT32 or
>>> exFat?
>>
>> It's an option to the mount command.
>> If you're using the one from the base system, see "man mount_msdosfs".
>
> I configured the system to automount the drive. I suppose I could
> just unmount it with "automount -fu" and them remount it via
> mount_msdosfs. I will give it a try.

There is an example of how to pass parameters through the main mount 
command in the mount man page.  Search for "option=value".