Subject: Re: Sharing disk with Win95 (Was: Re: booting off of second partitio
To: Phil Knaack <firstname.lastname@example.org>
From: Michael Graff <email@example.com>
Date: 04/22/1996 01:13:39
> The i386 port has two different places it looks for a disklabel on
>the disk: if no NetBSD/386BSD partitions are listed on the DOS partition table
>(tag 0xA5) then it expects the disklabel to be located on the second sector
>of the disk (the sector after the dos partition table).
This is an error I feel. We live under a system where partitions are
expected... there should always be a partition table with correct
information for the NetBSD side, not a hacked 50000 entry...
So you loose one cylinder. Big deal, even on big cylinders.
> If an A5 partition _does_ exist, it expects to find the disklabel on
>the second sector *of that partition*.
Which is what I'd expect.
> This is part of the problem. For some reason, even though I had a
>valid 0xA5 partition created, the "disklabel" program was WRITING the label
>I created to the second sector of the DISK, not of that PARTITION.
> When I did "disklabel -r -R wd0 wd0.label" just a moment later it
>told me it was writing to offset 512, and there went OSBS. (As an aside, for
>those tempted to ask, I did this several times with different "c" partitions
>specified. I left it out, I specified it as the whole disk (copy of "d"), and
>I specified it as the same as the dos-partition-table-0xA5 partition. Same
>results, always writes to offset 512.)
IMHO, d == whole disk, c == NetBSD partiton, a, b, e, f, g, h are all
within c if NetBSD, etc...
> If someone can point out something that I've done really stupid,
>please tell me. Or, if someone is aware of a bug in disklabel.c's calcu-
>lation of the destination offset, please tell me .. otherwise I'm going to
>keep poking about and learning more about the internals.
Here's what I did on my IDE drive:
o partitioned for a primary and ``extended'' DOS partition using
o used NetBSD's fdisk to alter the partiton type of the extended
partition to NetBSD.
o installed a disklabel and boot blocks, using disklabel.
o installed OS-BS beta from _dos mode_ of win95.
It just works.
Michael Graff <firstname.lastname@example.org> NetBSD is the way to go!
PGP key on a key-server near you! Netshade the world!
Cthulhu for president: Tired of voting for the *LESSER* of two evils?