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Date: Sun, 20 Nov 2011 08:59:56 -0600 (CST)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
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To: atr0x23@gmail.com, freebsd-questions@freebsd.org
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Cc: 
Subject: Re: The results of your email commands
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> From owner-freebsd-questions@freebsd.org  Sun Nov 20 05:44:42 2011
> Date: Sun, 20 Nov 2011 13:17:23 +0200
> From: thanos trompoukis <atr0x23@gmail.com>
> To: freebsd-questions@freebsd.org
> Subject: Re: The results of your email commands
>
> I saw that the usb device is like a scsi  "da"
> so now I am trying this:
> # mount -t msdosfs /dev/da0 /mnt/usb
> mount_msdosfs: /dev/da0: Invalid argument
> now what?  how I have to refered on my usb device?
> I do not understand a word here....!

The following is a 'catch *everything*' approch.
There are "less-drastic" ways,  bud you don't provide enough
information to determine what short-cuts are possible.

*FIRST* _shut_down_ the machine.
Next, remove the USB device.
Now, turn on the machine and boot into FreeBSD.
Do an 'ls -l' of the /dev directory.  save the output to a file in your home
directory.
Plug in the USB device.
Did you get system log and/or console messages about a new USB device?
 (if not, you may be missing USB device suport from the kernel0
Again, do an 'ls -l' of the /dev directoy.  Save the output to a *differnt*
file in your home directory.
Look for device entries that are mentioned in _this_ list, that are *not* in
the list you got when the USB device was not connected.

*THOSE* are the possible devices for the 'mount' command you are trying.