Date: Thu, 24 Oct 2002 18:17:32 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: grog@FreeBSD.org Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/lib/libdisk Makefile chunk.c write_alpha_dis Message-ID: <20021024.181732.07715741.imp@bsdimp.com> In-Reply-To: <20021025001556.GB53469@wantadilla.lemis.com> References: <20021024233323.GV53469@wantadilla.lemis.com> <20021024.180829.01187801.imp@bsdimp.com> <20021025001556.GB53469@wantadilla.lemis.com>
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In message: <20021025001556.GB53469@wantadilla.lemis.com>
"Greg 'groggy' Lehey" <grog@FreeBSD.org> writes:
: On Thursday, 24 October 2002 at 18:08:29 -0600, M. Warner Losh wrote:
: > In message: <20021024233323.GV53469@wantadilla.lemis.com>
: > "Greg 'groggy' Lehey" <grog@FreeBSD.org> writes:
: >>> How about Adaptec SCSI BIOS's and other "smart" BIOS's that look
: >>> at the MBR to guess what geometry you are using so that they can
: >>> adjust their BIOS to DTRT? These choke if you don't have a valid
: >>> MBR.
: >>
: >> They do? How do my -CURRENT machines work then?
: >
: > All FreeBSD disks have MBRs. The DD disks that some people use have
: > them, they are just hidden from you.
:
: But they're not valid MBRs.
They are valid MBRs from a data integrety point of view, but they are
not the right from a describing the geometry of the actual disk point
of view. These MBRs are known to screw up some disk controller's
bioses. One, but not all, of my aha cards are like this...
Warner
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