Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760284AbXHTP0w (ORCPT ); Mon, 20 Aug 2007 11:26:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751373AbXHTP0p (ORCPT ); Mon, 20 Aug 2007 11:26:45 -0400 Received: from iriserv.iradimed.com ([72.242.190.170]:4573 "EHLO iradimed.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753866AbXHTP0o (ORCPT ); Mon, 20 Aug 2007 11:26:44 -0400 Message-ID: <46C9B25B.9040208@cfl.rr.com> Date: Mon, 20 Aug 2007 11:25:15 -0400 From: Phillip Susi User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Jan Engelhardt CC: Robert Hancock , Brennan Ashton , Marty Leisner , linux-kernel@vger.kernel.org Subject: Re: power off disk drives while running References: <46C7551E.7090408@shaw.ca> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 20 Aug 2007 15:25:15.0680 (UTC) FILETIME=[4F08C200:01C7E33E] X-TM-AS-Product-Ver: SMEX-7.5.0.1243-5.0.1021-15368.001 X-TM-AS-Result: No-0.704600-5.000000-31 X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 756 Lines: 16 Jan Engelhardt wrote: > An IDE reset bringing the disk up again -- that does not sound like > it is powered down. Power down for me means: as if the plug was pulled. Reset means "power on, initialize power on state". While shutdown in this way, the drive has shut down and is not drawing any power. The reset is required to enable power flow into the drive again so it comes online. Essentially you have a transistor disconnecting the power inside the drive, and the reset pulse flips that transistor. - 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/