From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: WDC WD20EARS and 4k sector size Date: Mon, 24 Jan 2011 23:21:42 -0500 Message-ID: <4D3E4FD6.2020902@teksavvy.com> References: <20110125030410.GA24024@MAIL.13thfloor.at> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from ironport2-out.teksavvy.com ([206.248.154.183]:19198 "EHLO ironport2-out.pppoe.ca" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751692Ab1AYEVn (ORCPT ); Mon, 24 Jan 2011 23:21:43 -0500 In-Reply-To: <20110125030410.GA24024@MAIL.13thfloor.at> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Herbert Poetzl Cc: linux-ide@vger.kernel.org On 11-01-24 10:04 PM, Herbert Poetzl wrote: > > I recently bought the WDC WD20EARS-00MVWB0 because it > was really cheap for a drive with 64 MB cache, and I > wanted to try out a 4k sector size disk ... > > Now the drive performs quite well, is rather silent > and doesn't use much power or produce much heat, but > at first I didn't find anything in Linux indicating > that this drive would actually use 4k sectors. > > To shorten things, I asked around on IRC, had a chat > with some other folks, found a jumper description on > the WD site talking about an 'Advanced Format' jumper > and finally contacted WD in a lengthy email thread. My understanding about that jumper is that you DO NOT WANT THE JUMPER ON. Without the jumper, sector 0 is 4KB aligned, as is any sector multiple of 4. But WITH the jumper, sector 0 is no longer 4KB aligned.. everything shifts by one (or seven) such that sector 63 ends up being the start of a 4KB low-level sector, instead of the more sensible sector 64. Right?