Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761125AbXHGJcT (ORCPT ); Tue, 7 Aug 2007 05:32:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757827AbXHGJcF (ORCPT ); Tue, 7 Aug 2007 05:32:05 -0400 Received: from rv-out-0910.google.com ([209.85.198.191]:42086 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754815AbXHGJcD (ORCPT ); Tue, 7 Aug 2007 05:32:03 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:user-agent:mime-version:to:cc:subject:references:in-reply-to:x-enigmail-version:content-type:content-transfer-encoding; b=P2+78CQxiiypd2m6ZUowIB1YSyTz+d4ZVe7akE1s9ll/n5pQLq5QRfYTiNd32lVfRBIXg2bLj4ax8JkqSkKk+QXOk+QHlBQ8ogFLzH1pkms551pZz6h59YrL1KiLDKUjS8SoDgP948Q1cyBL/k3qwiRVwZsif4g6sippxsKa244= Message-ID: <46B83C0B.8050902@gmail.com> Date: Tue, 07 Aug 2007 18:31:55 +0900 From: Tejun Heo User-Agent: Icedove 1.5.0.10 (X11/20070307) MIME-Version: 1.0 To: Michael Sedkowski CC: "Rafael J. Wysocki" , Henrique de Moraes Holschuh , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-acpi@vger.kernel.org Subject: Re: Disk spin down issue on shut down/suspend to disk References: <838f88840708051428p3d65ff42w627af4bc38f57de3@mail.gmail.com> <1186411815.4355.7.camel@nx6310> <20070806150159.GC31615@khazad-dum.debian.net> <200708061732.03425.rjw@sisk.pl> <46B75459.9020204@gmail.com> <1186424492.4355.1.camel@nx6310> <46B76BBC.9010107@gmail.com> <1186438698.4402.6.camel@nx6310> <46B817AB.30105@gmail.com> <1186478319.3705.3.camel@nx6310> In-Reply-To: <1186478319.3705.3.camel@nx6310> X-Enigmail-Version: 0.94.2.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1479 Lines: 34 Michael Sedkowski wrote: > Dnia 07-08-2007, Wt o godzinie 15:56 +0900, Tejun Heo napisał(a): >> 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age >> Always - 388 >> >> I think this is the one. You can test it by forcefully powering off >> the >> machine (press power button for several secs or disconnect AC and >> battery) and see whether the count increases. >> > When I forcefully power off using the power button the raw value [last > one] rise by 1 point from 389 to 390. When I power off normally with > linux it remains constant. > Now could some one please explain to me what does that mean and am I in > danger of data loss? So, the ACPI routine puts the disk into the standby mode before powering off. That's good. On power off, the r/w heads in a disk should be unloaded (parked). This is usually achieved by either putting the disk into standby/sleep mode during shutdown. However, all modern disks can automatically unload their heads when the power is removed abruptly. This is called emergency unload. Emergency unload does shorten the lifespan of the disk but you don't have to worry too much about it. Disks are designed to withstand certain number of emergency unloads. -- tejun - 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/