Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764766AbYBMBVV (ORCPT ); Tue, 12 Feb 2008 20:21:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754075AbYBMBVH (ORCPT ); Tue, 12 Feb 2008 20:21:07 -0500 Received: from smtpq1.tilbu1.nb.home.nl ([213.51.146.200]:46311 "EHLO smtpq1.tilbu1.nb.home.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753513AbYBMBVF (ORCPT ); Tue, 12 Feb 2008 20:21:05 -0500 Message-ID: <47B24663.4070101@keyaccess.nl> Date: Wed, 13 Feb 2008 02:22:43 +0100 From: Rene Herman User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: Jan Engelhardt CC: David Miller , chris.mason@oracle.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, btrfs-devel@oss.oracle.com Subject: Re: BTRFS partition usage... References: <200802120935.20437.chris.mason@oracle.com> <20080212.153836.166202106.davem@davemloft.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -1.0 (-) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1277 Lines: 28 On 13-02-08 00:42, Jan Engelhardt wrote: > x86 MSDOS partition table layout starts counting with sector 1, which is > (not so intuitively) starting at 0x7e00 (and there's no sector 0, > probably for safety). Well, each ptable format with its own quirks. I haven't followed this thread, but in case it matters -- this sounds fairly confused. Not sure what you're saying, but the MSDOS partition table has its root table in the very first sector on the disk, at offset 0x1be = 0x200 - 4 * sizeof(struct partition) - 2 (that is, 4 entries at the end of that first sector, followed by a 2-byte signature). That 0x7e00 that you are speaking of sounds somewhat like the _memory_ address the BIOS loads that first sector to: 0x7c00. It then jumps there to start the ball rolling but 0x7c00 is not an on-disk reality or anything. MS-DOS partition tables are furthermore fully outside the actual partitions themselves and as such I believe not all together relevant to the issue? (as said, not following along though...) Rene -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/