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Date: Fri, 23 May 2014 21:57:38 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Gary Aitken <freebsd@dreamchaser.org>
Subject: Re: write-protected usb flash drive
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On Fri, 23 May 2014, Gary Aitken wrote:

> I'm having trouble locating what I want --
> a physically write-protected flash drive.
> My searches so far have come up empty.
> Thought someone here would know of one if it exists.
> I don't want or need additional encryption gimicks on it.
> Anyone know of one?  32G or larger

USB, you mean?  I found this:
http://www.fencepost.net/2010/03/usb-flash-drives-with-hardware-write-protection/

Newegg has some Kanguru drives with the write protect switch.