From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: WDC WD15EARS-00Z5B1: harddrive which does crazy unloading Date: Thu, 11 Mar 2010 14:38:16 +0900 Message-ID: <4B9881C8.10506@kernel.org> References: <201002081933.10144.suse-linux@ml082.pinguin.uni.cc> <4B96013F.1050904@kernel.org> <4B965DE7.7000109@teksavvy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:50665 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751286Ab0CKFiV (ORCPT ); Thu, 11 Mar 2010 00:38:21 -0500 In-Reply-To: <4B965DE7.7000109@teksavvy.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: Al Bogner , linux-ide@vger.kernel.org Hello, On 03/09/2010 11:40 PM, Mark Lord wrote: > The default on these drives is to unload heads > after a mere eight (8) seconds of inactivity. > > Ugh. Heh, yeah, that's pretty low. I hope they eventually learn to adjust that dynamically considering running avg of intervals between writes. It shouldn't be too hard. > The wdidle3-1.03 DOS tool can fix that. Google it. > > I have disassembled that tool here, and found a few > vendor-unique commands inside it. But thus far have > not managed to get them working natively in Linux. > > I really need a SATA tracer/analyser.. Hmmm... so they don't respond to ATA APM command? Thanks. -- tejun