Date: Fri, 27 Aug 2021 19:25:24 +0200 From: Ralf Mardorf <ralf-mardorf@riseup.net> To: freebsd-questions@freebsd.org Subject: Re: Paritioning scheme on MBR disk doubts Message-ID: <20210827192524.5cc7bf5b@archlinux> In-Reply-To: <20210827190208.4280496c@archlinux> References: <MW4PR01MB640175FEDE09CAD451A9AA0BC4C79@MW4PR01MB6401.prod.exchangelabs.com> <20210826203921.0d3537684706867aef1e30f9@sohara.org> <20210827071306.34e90c17@archlinux> <MW4PR01MB64019B5A0BF71C138BBD6554C4C89@MW4PR01MB6401.prod.exchangelabs.com> <20210827190208.4280496c@archlinux>
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On Fri, 27 Aug 2021 19:02:08 +0200, Ralf Mardorf wrote: >On Fri, 27 Aug 2021 16:02:35 +0200, Javier wrote: >>Anyway, all this makes me ask now... does FreeBSD have any kind of >>limitation I could suffer in the way the MBR implementation is >>setup/programmed? =20 > >I'm not aware of limitation you need to worry about in real world >scenarios, other than... > >(I'm mainly a Linux multi-boot user. I migrated from GRUB legacy to >GRUB 2 to syslinux. However, in the past I also chainloaded FreeBSD. >All my old internal HDDs were, as well as my new internal SSDs and >external HDDs are <=3D 2 TiB MBR drives only.) > >...the other day I read something scary. It's not related to an >operating system, bootloader or partitioning tool. It's a hardware >issue. > >Some mobo vendors have dropped legacy BIOS support, thus they dropped >booting an operating system from MBR formatted devices. It's required >to migrate from MBR to GPT for those drives, if there is the need to >replace a mobo, by another one that doesn't provide a legacy BIOS >option. IIRC the related Unified Extensible Firmware Interface term for >booting MBR partitions is "CSM support". Off-topic: =46rom a Linux user point of view using MBR is important, to clearly express, that PID 1 is the init process and not at all related to a bootloader. Keyword "systemd-boot" ... can't be used with MBR.
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