From owner-svn-src-head@FreeBSD.ORG Fri Dec 10 08:52:37 2010 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EC720106566B; Fri, 10 Dec 2010 08:52:37 +0000 (UTC) (envelope-from bruce@cran.org.uk) Received: from muon.cran.org.uk (muon.cran.org.uk [IPv6:2a01:348:0:15:5d59:5c40:0:1]) by mx1.freebsd.org (Postfix) with ESMTP id 74C878FC13; Fri, 10 Dec 2010 08:52:37 +0000 (UTC) Received: from muon.cran.org.uk (localhost [127.0.0.1]) by muon.cran.org.uk (Postfix) with ESMTP id 9B038E7178; Fri, 10 Dec 2010 08:52:36 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=cran.org.uk; h=date:from :to:cc:subject:message-id:in-reply-to:references:mime-version :content-type:content-transfer-encoding; s=mail; bh=ldfMEJIY1iUi PNww7/Kz8zlRdnU=; b=vySA0PpCn1iB1c/sWA+gZYrKnE3jT7K+nCYk2GepgvEk mCTXUE28gd52+jb5+6HW9YRNKzMIAr9KblD2JlFwjCgBoFSPugTvrrnKACuiuxUF wC5gS4f9ZPBDbaX+eCjR7hcVvdK+HXvg9XmA4zHgE2E5Vd0QeF/8j5yIhg3atcY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=cran.org.uk; h=date:from:to :cc:subject:message-id:in-reply-to:references:mime-version :content-type:content-transfer-encoding; q=dns; s=mail; b=riqghJ MWTskZUNhUeOFU7IDXRIx5s4myvLMnl7HT73q95T8sfNbwaeGNk8o8Yp2R0WZ/rz 37qiskBD0c/8MChHYSDK3Hlu/CrnrWsqshCAFzv3UhrJ9/VHVfDY/SUtNNk/UEwj c9NCyPRkMWdhjGOYk32DK7VZOWKsaeG/xAdiY= Received: from core.draftnet (client-86-27-21-134.glfd.adsl.virginmedia.com [86.27.21.134]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by muon.cran.org.uk (Postfix) with ESMTPSA id 37E28E7174; Fri, 10 Dec 2010 08:52:36 +0000 (GMT) Date: Fri, 10 Dec 2010 08:52:26 +0000 From: Bruce Cran To: Erik Trulsson Message-ID: <20101210085226.5cf2b42b@core.draftnet> In-Reply-To: <20101210010023.GA68703@owl.midgard.homeip.net> References: <201012072046.oB7KkB4L079555@svn.freebsd.org> <4CFEAD09.30904@freebsd.org> <4CFEAFA6.4020103@feral.com> <4CFEB1AD.70906@freebsd.org> <20101208153857.H1428@besplex.bde.org> <20101208225235.501ced0e@core.draftnet> <20101209191657.B1400@besplex.bde.org> <20101209221458.42448075@core.draftnet> <20101210010023.GA68703@owl.midgard.homeip.net> X-Mailer: Claws Mail 3.7.7 (GTK+ 2.22.1; amd64-portbld-freebsd9.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, Andriy Gapon , Bruce Evans , Bruce Cran , svn-src-head@freebsd.org, Matthew Jacob Subject: Re: svn commit: r216269 - head/sys/geom/part X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Dec 2010 08:52:38 -0000 On Fri, 10 Dec 2010 02:00:23 +0100 Erik Trulsson wrote: > Modern drives do not really report 'the current CHS geometry'. They > report a fake geometry that normally do not have anything do with the > actual geometry. (As an example just about all modern ATA/SATA drives > report having 16 heads, while in reality none of them have more than > 10 heads and most of them have fewer heads than that.) Note that I said 'current', not 'correct' :) They do continue to report the current CHS geometry that the BIOS has configured: for example overriding the settings to use a setting of 8H instead of 16H in the BIOS does get detected by FreeBSD when it reads the 'current CHS geometry' fields. And yes, the only thing that's useful for nowadays is configuring the MBR or BSD disklabel. -- Bruce Cran