From owner-freebsd-hackers@FreeBSD.ORG Thu Oct 21 16:20:30 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D6127106564A for ; Thu, 21 Oct 2010 16:20:30 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from ch-smtp02.sth.basefarm.net (ch-smtp02.sth.basefarm.net [80.76.149.213]) by mx1.freebsd.org (Postfix) with ESMTP id 5DFFA8FC14 for ; Thu, 21 Oct 2010 16:20:29 +0000 (UTC) Received: from c83-255-61-120.bredband.comhem.se ([83.255.61.120]:21555 helo=falcon.midgard.homeip.net) by ch-smtp02.sth.basefarm.net with esmtp (Exim 4.68) (envelope-from ) id 1P8xcz-0003Zn-74 for freebsd-hackers@freebsd.org; Thu, 21 Oct 2010 18:04:31 +0200 Received: (qmail 21776 invoked from network); 21 Oct 2010 17:57:46 +0200 Received: from owl.midgard.homeip.net (10.1.5.7) by falcon.midgard.homeip.net with ESMTP; 21 Oct 2010 17:57:46 +0200 Received: (qmail 34354 invoked by uid 1001); 21 Oct 2010 17:57:46 +0200 Date: Thu, 21 Oct 2010 17:57:46 +0200 From: Erik Trulsson To: Dag-Erling =?iso-8859-1?Q?Sm=F8rgrav?= Message-ID: <20101021155746.GA34322@owl.midgard.homeip.net> References: <201009161742.24228.tijl@coosemans.org> <201009161619.o8GGJAmv035378@lurza.secnetix.de> <20101018155944.GA12425@freebsd.org> <868w1r92rf.fsf@ds4.des.no> <20101021122110.GA65490@freebsd.org> <86zku77mj6.fsf@ds4.des.no> <20101021135442.000054c9@unknown> <86vd4v7gx1.fsf@ds4.des.no> <20101021160335.00001c0a@unknown> <864ocf7esp.fsf@ds4.des.no> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <864ocf7esp.fsf@ds4.des.no> User-Agent: Mutt/1.5.20 (2009-06-14) X-Originating-IP: 83.255.61.120 X-Scan-Result: No virus found in message 1P8xcz-0003Zn-74. X-Scan-Signature: ch-smtp02.sth.basefarm.net 1P8xcz-0003Zn-74 de4ad3b40df4172b1bc6e34bf1736985 Cc: Bruce Cran , Tijl Coosemans , Oliver Fromme , freebsd-hackers@freebsd.org, mav@freebsd.org, Alexander Best Subject: Re: Summary: Re: Spin down HDD after disk sync or before power off X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Oct 2010 16:20:30 -0000 On Thu, Oct 21, 2010 at 05:20:54PM +0200, Dag-Erling Sm=F8rgrav wrote: > Bruce Cran writes: > > The Ubuntu issue was what I was thinking of - I got that mixed up with > > the aggressive power management of the WD EARS drives. >=20 > The entire Green series, actually, which includes models such as the > EADS, AARS etc., but there's more to them than that - the central > feature is their dynamically adjusted rotational speed, which allows > them to conserve power without spinning all the way down. They do not have any dynamically adjusted rotational speed, despite what Western Digitals marketing department would like you to believe. Tests by various reliable review sites have shown that all the Green models examined so far spin at 5400RPM with no variations. (See e.g. http://www.silentpcreview.com/article786-page2.html or http://www.storagereview.com/1000.sr?page=3D0,0 ) There could be differences in rotational speed between different models (but no such difference has been reported yet), but they all have a fixed RPM. --=20 Erik Trulsson ertr1013@student.uu.se