Date: Thu, 26 Aug 2021 23:36:13 +0200 From: Javier <nixlist@outlook.es> To: freebsd-questions@freebsd.org Subject: Re: Paritioning scheme on MBR disk doubts Message-ID: <MW4PR01MB64019997B1518BFEEF524637C4C79@MW4PR01MB6401.prod.exchangelabs.com> In-Reply-To: <20210826203921.0d3537684706867aef1e30f9@sohara.org> References: <MW4PR01MB640175FEDE09CAD451A9AA0BC4C79@MW4PR01MB6401.prod.exchangelabs.com> <20210826203921.0d3537684706867aef1e30f9@sohara.org>
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Hi, thanks for the helpful answer :) > > 1) DOS|GNU/Linux > > > > MBR > > +---Primary/Extended* 1 > > +---Primary/Extended* 2 > > +---Primary/Extended* 3 > > +---Primary/Extended* 4 > > (if Extended) > > +---Logic 1 > > +---Logic 2 > > +---. > > +---. > > +---. > > +---Logic nth > > Yep - except IMSC n is no more than 4. IMSC ? If you mean the same as what Christian told, I never had that limit of 4 logical in an extended partition. > This the standard way of installing FreeBSD on an MBR based > system - FreeBSD docs call the MBR partitions slices because they > wanted to keep the partition name as used on other platforms. Yes, I learned that, thanks :) I'd have to get used. > > Can a whole FreeBSD installation (mountpoints) be spread along > > multiple slices? > > Yes but the installer won't be much help. I see. I'll have to try what are the limits there and/or imagine how to organize the disk. > Unless MBR has changed since I last looked there could only > be one extended partition(slice) and it had to be the fourth. Other > than that this should work. Yes, is limited to 1. I originally intended to share an image where it was all clearer, but image size and that it was going to be outside the list, I gave up. Here it is. It is outdated and wrong in comparison with the schemes sent to the list as I learned the 8 partition limits after I made the image: https://i.ibb.co/Mgxz2qZ/freebsd-part.png This is the last edit and I haven't reviewed if it is the same I posted here: https://i.ibb.co/f2RZFst/bsdpart2021-08.png What I'm not sure about the place, if it needed to be fourth. I always set the last, but I don't remember if by restrictions, just for simplicity. I'll have to check because otherwise I'd have a big headache. The other option is just run on a virtual machine with enough space for it until I get used to FreeBSD and then cross the fingers to jump to a reorganized physical disk (after backups madness). > One more option (that you probably don't want), you can put > a BSD disklabel on the whole disc and not have an MBR or GPT at all > - this is called Dangerously Dedicated. I mention this only for > completeness. Thanks, but it will be shared with other OSs :) Not to mention that I'd still need more than 8 partitions. > > Despite I ask for MBR scheme, that is my BIOS/Disk system, I guess > > answers should be applicable to GPT, more or less, with its > > differences. > > GPT is *much* simpler if you want lots of partitions - > there's just one level and you can have as many as you like. No > partition/slice confusion, no BSD disklabels, no extended > partitions just a bunch of partitions with names that you provide. > MBR is considered obsolete and GPT the replacement. > > Highly recommend using GPT if all the OSs can use it. I know, but my system is "old" and doesn't support GPT (with BIOS instead EFI I'd say instead old; by the time could have EFI, but it doesn't). It is just what I have. Regards.
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