From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 21 May 2001 03:17:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 21 May 2001 03:17:48 -0400 Received: from saturn.cs.uml.edu ([129.63.8.2]:10765 "EHLO saturn.cs.uml.edu") by vger.kernel.org with ESMTP id ; Mon, 21 May 2001 03:17:43 -0400 From: "Albert D. Cahalan" Message-Id: <200105210716.f4L7Gte504365@saturn.cs.uml.edu> Subject: Re: LANANA: To Pending Device Number Registrants To: dwguest@win.tue.nl (Guest section DW) Date: Mon, 21 May 2001 03:16:55 -0400 (EDT) Cc: acahalan@cs.uml.edu (Albert D. Cahalan), Mauelshagen@sistina.com, thomasko321k@gmx.at (Thomas Kotzian), helgehaf@idb.hist.no (Helge Hafting), linux-kernel@vger.kernel.org In-Reply-To: <20010517113924.B9270@win.tue.nl> from "Guest section DW" at May 17, 2001 11:39:24 AM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Guest section DW writes: > On Thu, May 17, 2001 at 02:35:55AM -0400, Albert D. Cahalan wrote: >> The PC partition table has such an ID. The LILO change log >> mentions it. I think it's 6 random bytes, with some restriction >> about being non-zero. > > You are confused. The partition table contains IDs, but these are > the numbers like 83 for a Linux partition. No disk-identifying numbers. Care to explain "duplicate MBR signature handling" in the GPT FAQ? While describing the new-style partitions, Microsoft mentions that Windows 2000 has a way to mark old-style ("MBR") partitions: : 58. What happens if a duplicate Disk or Partition GUID is detected? : Windows Whistler will generate new GUIDs for any duplicate Disk GUID, : MSR Partition GUID, or MSR basic data GUID upon detection. This is : similar to the duplicate MBR signature handling in Windows 2000. : Duplicate GUIDs on a dynamic container or database partition : cause unpredictable results. Well, the way to test this would be with Windows 2000, two disks, and a Linux rescue disk that has "dd" on it. See what gets changed when the "duplicate MBR signature handling in Windows 2000" runs.