Date: Sun, 19 Nov 2000 17:36:21 -0700 From: Warner Losh <imp@village.org> To: Greg Lehey <grog@lemis.com> Cc: Sam Zamarripa <samz@oz.net>, stable@FreeBSD.ORG Subject: Re: Dedicated disks (was: Dangerously Dedicated) Message-ID: <200011200036.RAA16154@harmony.village.org> In-Reply-To: Your message of "Mon, 20 Nov 2000 10:52:11 %2B1030." <20001120105211.O58333@echunga.lemis.com> References: <20001120105211.O58333@echunga.lemis.com> <20001120095100.G58333@echunga.lemis.com> <200011192231.eAJMVIF09854@mass.osd.bsdi.com> <008901c05278$b71a6f50$0200000a@sam> <20001120095100.G58333@echunga.lemis.com> <200011200019.RAA16004@harmony.village.org>
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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
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