Date: Sat, 13 Jan 2007 00:03:41 -0800 From: Jo Rhett <jrhett@svcolo.com> To: Marcel Moolenaar <xcllnt@mac.com> Cc: stable@FreeBSD.org Subject: Re: 2.4TB disk - MBR and GPT coexist? Message-ID: <45A8925D.7050303@svcolo.com> In-Reply-To: <59462C3F-B132-4597-8462-8BF3E031789F@mac.com> References: <45A5FD8A.6080409@svcolo.com> <2918081F-D376-410B-B6FD-42BDD3323575@svcolo.com> <20070111213444.GB17185@zone3000.net> <D0D0CE06-B991-4945-B12B-152BA930106B@svcolo.com> <F3B0BD49-133C-4BD4-A747-68BD75F72D63@mac.com> <45A74F01.7040200@svcolo.com> <59462C3F-B132-4597-8462-8BF3E031789F@mac.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> On Jan 12, 2007, at 1:04 AM, Jo Rhett wrote: >> To make this into a step-by-step, what do you mean by "restore the MBR >> partition" ? From backup, or...? Marcel Moolenaar wrote: > Manually recreate, I guess. When creating a GPT, the MBR is replaced > by a PMBR. A PMBR is a MBR with a single partition spanning the > whole disk (or as much as can be covered by the MBR) that has type > 0xEE. The GPT kernel code expects such a partition but does not care > if there are others. If you restore the MBR from a backup, the 0xEE > partition will be gone and the GPT will not be used. > > It would probably be nice if gpt(8) could migrate without destroying > the existing MBR partition, because restoring the MBR partition is > the least intuitive step. Let me think about this for a bit... I am very interested in solving this problem, and have machines I am more than willing to dedicate to this project. I'm just somehow lacking a clear understanding of what I need to do to test this: 1. Install FreeBSD with a normal MBR partition and leftover free space 2. Migrate the partition to GPT (can I do this from CD fixit mode?) 3. Create a GPT partition using the remaining space 4. Recreate the MBR partition in the original space ... this makes sense, but I suspect that I'm missing a step/option here. -- Jo Rhett senior geek Silicon Valley Colocation
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?45A8925D.7050303>