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Date: Tue, 4 Aug 2015 09:18:03 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: jd1008 <jd1008@gmail.com>
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Subject: Re: USB stick and some help with it.
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On Mon, 3 Aug 2015, jd1008 wrote:

> I thought that you need to
>
> dd if=/dev/zero of=/dev/rda1 ....etc

As far as I know, FreeBSD does not have "rda" devices.

Using dd(1) to erase flash devices is generally not a good idea.  It 
causes unnecessary wear to them and messes with TRIM.

> And be sure it is NOT mounted at all when you run the dd.

Right, that will just cause an error.

> Note that you must use the raw and not the block device.

On which version of FreeBSD are you finding these raw devices?