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Date: Tue, 4 Aug 2015 09:20:48 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: jd1008 <jd1008@gmail.com>
cc: freebsd-questions@freebsd.org
Subject: Re: USB stick and some help with it.
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On Mon, 3 Aug 2015, jd1008 wrote:

> On 08/03/2015 10:21 AM, Bernt Hansson wrote:
>> On 2015-08-03 18:00, jd1008 wrote:
>>> Are you invoking the command as root or regular user?
>> 
>> As root.
> If your installation cannot write to the raw device, then
> it  is either a bug or .....????
>
> One thing that you have to be aware of is that if you
> dd an iso image to a flash, then afterwards, the OS
> will always assume it is a non-writable cdrom; that
> is until you dd /dev/zero into the raw device while
> it is not mounted.

I have not ever had that experience.  Of course, on FreeBSD we do not 
use the same images for USB memory sticks and CDs.