From owner-freebsd-current@FreeBSD.ORG  Fri Sep 13 05:05:31 2013
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Date: Fri, 13 Sep 2013 07:05:18 +0200
From: Joel Dahl <joel@vnode.se>
To: Uzumaki Naruto <narutopc@outlook.com>
Subject: Re: mountroot> while booting r255342 memstick
Message-ID: <20130913050518.GA67729@devbox.vnode.local>
References: <SNT149-W61F47563235A39D56EF0E3DC3A0@phx.gbl>
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Cc: mav@freebsd.org,
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On Thu, Sep 12, 2013 at 12:32:12AM +0000, Uzumaki Naruto wrote:
> Hi,
> I downloaded FreeBSD-10.0-CURRENT-amd64-20130907-r255342-memstick.img and dd into KINGSTON DT 101 G2 1.00 USB pendrive

Looks similar to what I reported back in February:
http://lists.freebsd.org/pipermail/freebsd-current/2013-February/039542.html

mav@ committed a fix for this here:
http://lists.freebsd.org/pipermail/svn-src-head/2013-February/045143.html

Perhaps a quirk is needed for your USB pendrive as well. 

-- 
Joel