Date: Fri, 17 Feb 2012 13:50:08 -0800 From: Freddie Cash <fjwcash@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: wblock@wonkity.com, freebsd-stable@freebsd.org, 000.fbsd@quip.cz, mandrews@bit0.com, freebsd@jdc.parodius.com Subject: Re: New BSD Installer Message-ID: <CAOjFWZ5Jm9M27J=%2B2jj5b4mSyE_i1Jq2YyXBKs%2BPabrUQyiYhg@mail.gmail.com> In-Reply-To: <4F3EC8DD.6040500@FreeBSD.org> References: <CAOjFWZ5EhGFr_Vp0%2BTRfxvgm6KZxv9QO3UfVdKurA96z3axDMQ@mail.gmail.com> <20120217.160430.406937514120319292.hrs@allbsd.org> <4F3E3000.9000206@FreeBSD.org> <20120217.232843.2212672671663755444.hrs@allbsd.org> <4F3EC8DD.6040500@FreeBSD.org>
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On Fri, Feb 17, 2012 at 1:38 PM, Andriy Gapon <avg@freebsd.org> wrote: > And just in case: > Unified Extensible Firmware Interface Specification Version 2.3.1, Errata A > September 7, 2011 says: > [snip] >> Two GPT Header structures are stored on the device: the primary and the >> backup. The primary GPT Header must be located in LBA 1 (i.e., the second >> logical block), and the backup GPT Header must be located in the last LBA >> of the device. > > I can not see any ambiguity or openness to interpretation in this paragraph. Unless it's specified somewhere else (which is possible), in this paragraph, "device" does not necessarily mean "physical disk". "Last LBA of the device" could be interpreted as "last LBA of the GEOM provider". The beauty of GEOM is that "device" is whatever logical mapping it provides. After all, LBAs are logical addresses (it's right there in the name!), not hardwired physical sector addresses. ;) If they were hardwired, then how would internal sector remapping work? ;) -- Freddie Cash fjwcash@gmail.com
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