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 <[EMAIL PROTECTED]> 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
>
>
>
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