From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Howorth Subject: Re: AMD SP5100 SATA low perfomance Date: Fri, 27 Jul 2012 11:57:18 +0100 Message-ID: <5012740E.7040507@mrc-lmb.cam.ac.uk> References: <20120724204454.GC5167@liondog.tnic> <20120726100440.GB30717@aftab.osrc.amd.com> <20120726180854.GD9161@aftab.osrc.amd.com> <20120727090719.GA13992@aftab.osrc.amd.com> <20120727102521.GA14445@aftab.osrc.amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from ppsw-50.csi.cam.ac.uk ([131.111.8.150]:42143 "EHLO ppsw-50.csi.cam.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751520Ab2G0K5Z (ORCPT ); Fri, 27 Jul 2012 06:57:25 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: "Rus V. Brushkoff" Cc: Borislav Petkov , linux-ide@vger.kernel.org Rus V. Brushkoff wrote: >> So the Hitachi ones are lighter than the WD ones and behave like mobile >> hdds in that respect. > > Yes, these Hitachi is lighter and more sensitive to vibrations - even > hanging on wires is sufficient for twice perfomance drop - the whole > vibro silence is requred for it to reach the max speed. I think this > is mostly the hardware design flaw of this particular model - will > return all of them. Well, you said that the 2.5" WD drives showed the same symptoms, so I don't see how you conclude the problem is Hitachi-specific. It seems more likely to be an interaction between some (or all) 2.5" drives and the particular case/fan combination. How are the 2.5" drives mounted in the cases? Perhaps it would be fixable by using low-vibration fans or fan mounting kits. Perhaps mounting the drives on a lump of solid metal to bring them up to the same mass as a 3.5" drive would fix it. Perhaps resilient mounting of the drives would fix it. Perhaps a stiffer/heavier case would fix it. Now that you know the problem is hardware-related, the same symptoms should show up using Windows (or any other OS). So maybe Hitachi (and WD and the case and fan manufacturers) might now be interested in finding a better cure, or at least warning potential customers.