From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Some of mine ST31000520AS drives unloads head very frequent and I cannot set APM on them Date: Mon, 09 Nov 2009 17:19:49 +0900 Message-ID: <4AF7D0A5.5030502@kernel.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:55372 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752138AbZKIITt (ORCPT ); Mon, 9 Nov 2009 03:19:49 -0500 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Fredrik Tuomas Cc: linux-ide@vger.kernel.org Sorry about the long delay. Fredrik Tuomas wrote: > In the pdf on > > http://www.seagate.com/staticfiles/support/disc/manuals/desktop/Barracuda%20LP/100564361a.pdf > > you can read that APM is not supported on the disk. Now I'm confused. > I can set APM on at least one of my drives. How can I prohibit the > excessive loading/unloading of the heads if APM not is supported? There are drives with vendor specific commands for controlling powersaving behavior. Unfortunately, you'll have to contact the vendor for those. :-( Thanks. -- tejun