Date: Thu, 14 Dec 2000 19:46:47 -0800 (PST) From: Glendon Gross <gross@clones.com> To: Warner Losh <imp@village.org> Cc: Greg Lehey <grog@lemis.com>, Sam Zamarripa <samz@oz.net>, stable@FreeBSD.ORG Subject: Re: Dedicated disks (was: Dangerously Dedicated) Message-ID: <Pine.LNX.4.20.0011200753510.9418-100000@mail.clones.com> In-Reply-To: <200011200036.RAA16154@harmony.village.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Please correct me if I am wrong, but this discussion seems to revolve around a problem that results from nonstandard BIOS routines. On Sun, 19 Nov 2000, Warner Losh wrote: > In message <20001120105211.O58333@echunga.lemis.com> Greg Lehey writes: > : > No it isn't bogus. You can't boot off a DD disk on some machines > : > because the MBR is too bogus for the BIOS to cope with. > : > : So you put a Microsoft partition table on the boot disk. That doesn't > : mean you need it on the other disks. > > On some systems, this works. On others it doesn't. Some systems > throw a rod when they see the bogus partition table, even if it isn't > on the primary disk. > > : > The problem with DD is that we put a bogus MBR onto the disk. All > : > that is necessary to fix it would be to put a non-bgous MBR onto the > : > disk. > : > : Right, for those cases where it's needed. More specifically, we need > : to now how non-bogus it needs to be. > > It must describe most/all of the disk. It must allow the BIOS to > figure out the geometry so that the boot loader could read the disk > (note, I say could because it might not be the primary disk, and a > bogus partition could cause the BIOS to lose its brain). > > I think, and I haven't checked this out yet, that we could make the > partition end c/h/s rounded to the end of the cylinder nearest the > real end of the disk. > > Warner > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.LNX.4.20.0011200753510.9418-100000>