Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932230AbVKUItI (ORCPT ); Mon, 21 Nov 2005 03:49:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932233AbVKUItI (ORCPT ); Mon, 21 Nov 2005 03:49:08 -0500 Received: from ns2.suse.de ([195.135.220.15]:59790 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S932230AbVKUItH (ORCPT ); Mon, 21 Nov 2005 03:49:07 -0500 Message-ID: <438189ED.3080305@suse.de> Date: Mon, 21 Nov 2005 09:48:45 +0100 From: Stefan Seyfried User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050715 Thunderbird/1.0.6 Mnenhy/0.7.2.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Pavel Machek Cc: Alistair John Strachan , Marc Perkel , linux-kernel@vger.kernel.org, Alan Cox Subject: Re: Does Linux support powering down SATA drives? References: <437F63C1.6010507@perkel.com> <1132426887.19692.11.camel@localhost.localdomain> <200511191900.12165.s0348365@sms.ed.ac.uk> <1132431907.19692.15.camel@localhost.localdomain> <20051120235550.GI2556@spitz.ucw.cz> In-Reply-To: <20051120235550.GI2556@spitz.ucw.cz> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1197 Lines: 27 Pavel Machek wrote: > On Sat 19-11-05 20:25:07, Alan Cox wrote: >> The latest kernels support command passthrough for SMART and the like >> but hdparm -S does not "switch off" anything. It may spin a drive down >> but the power consumption of 23 hours a day of "spun down" is >> significant, probably more than the hour it is powered up. > > Really? Harddrive does not contain AC/DC converters, so situation should be slightly > better there, no? it is 7.5W vs. 0.9W (idle vs standby or sleep) on a Barracuda 120GB 7200rpm desktop drive. Notebook drives are doing better: 0.65W vs 0.25W (idle vs standby) or 0.65W vs 0.1W (idle vs sleep) on some Hitachi Travelstar. Better than nothing, but pulling the plug is even better :-) -- Stefan Seyfried \ "I didn't want to write for pay. I QA / R&D Team Mobile Devices \ wanted to be paid for what I write." SUSE LINUX Products GmbH, N?rnberg \ -- Leonard Cohen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/