From owner-freebsd-questions@FreeBSD.ORG  Thu Nov 15 09:39:11 2012
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id A7EDAAFE
 for <freebsd-questions@freebsd.org>; Thu, 15 Nov 2012 09:39:11 +0000 (UTC)
 (envelope-from mueller23@insightbb.com)
Received: from mail.insightbb.com (smtp3.insight.synacor.com [208.47.185.25])
 by mx1.freebsd.org (Postfix) with ESMTP id 654808FC08
 for <freebsd-questions@freebsd.org>; Thu, 15 Nov 2012 09:39:10 +0000 (UTC)
X_CMAE_Category: 0,0 Undefined,Undefined
X-CNFS-Analysis: v=2.0 cv=O+27TWBW c=1 sm=0 a=Dm9TOXL4taQ+Gy1KovpL+A==:17
 a=jLN7EqiLvroA:10 a=9YQ-1ebCAAAA:8 a=-xSEaY_UsmsA:10 a=6I5d2MoRAAAA:8
 a=nQ6UNwu886BEUUOGEoIA:9 a=hRzl48OXmVwA:10 a=Dm9TOXL4taQ+Gy1KovpL+A==:117
X-CM-Score: 0
X-Scanned-by: Cloudmark Authority Engine
Authentication-Results: smtp02.insight.synacor.com
 header.from=mueller23@insightbb.com; sender-id=softfail
Authentication-Results: smtp02.insight.synacor.com
 smtp.mail=mueller23@insightbb.com; spf=softfail; sender-id=softfail
Received-SPF: softfail (smtp02.insight.synacor.com: transitional domain
 insightbb.com does not designate 74.130.198.7 as permitted sender)
Received: from [74.130.198.7] ([74.130.198.7:54003] helo=localhost)
 by mail.insightbb.com (envelope-from <mueller23@insightbb.com>)
 (ecelerity 2.2.3.49 r(42060/42061)) with ESMTP
 id 4B/91-25607-F66B4A05; Thu, 15 Nov 2012 04:31:28 -0500
Date: Thu, 15 Nov 2012 04:31:27 -0500
Message-ID: <4B.91.25607.F66B4A05@smtp02.insight.synacor.com>
From: "Thomas Mueller" <mueller23@insightbb.com>
To: freebsd-questions@freebsd.org
Subject: Re: Mounting SD card.
Cc: Mike Clarke <jmc-freebsd2@milibyte.co.uk>
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 15 Nov 2012 09:39:11 -0000

> >I think that's pretty much standard behaviour. The solution appears to be
> >to "wake" it up with the following incantation:

> >    dd if=/dev/null of=/dev/da0 count=0

> >That's what works here. See the thread starting with
> ><http://lists.freebsd.org/pipermail/freebsd-questions/2010-February/212109.html>

> true > /dev/da0

> is a little shorter and safer.  The search keywords for this are "GEOM
> retaste" or "retasting".

Could you also do a read such as

dd if=/dev/da0 of=/dev/null bs=16k count=1

?


Tom