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Date:      Tue, 11 Dec 2001 08:39:43 +0100
From:      Joerg Wunsch <j@uriah.heep.sax.de>
To:        freebsd-current@FreeBSD.org
Subject:   Re: cvs commit: src/sys/kern subr_diskmbr.c
Message-ID:  <20011211083943.Q97235@uriah.heep.sax.de>
In-Reply-To: <20011211111629.O63585@monorchid.lemis.com>; from grog@FreeBSD.org on Tue, Dec 11, 2001 at 11:16:29AM %2B1030
References:  <200112101150.aa33241@salmon.maths.tcd.ie> <20011210222003.4391539F0@overcee.netplex.com.au> <20011209102129.F97235@uriah.heep.sax.de> <20011210004350.6703C3810@overcee.netplex.com.au> <200112092200.fB9M0J660085@uriah.heep.sax.de> <20011210005928.9538A3810@overcee.netplex.com.au> <20011210091103.M97235@uriah.heep.sax.de> <20011211111629.O63585@monorchid.lemis.com>

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As Peter Wemm wrote:

> Yes, that is much safer, however there are certain bioses that have
> interesting quirks that the MBR has to work around.  The problem
> when overlapping mbr and boot1 into the same block is that we no
> longer have the space to do that.  boot1.s has got *3* bytes free.

Too bad.

Peter, do you care to update the section about DD mode (and its
dangers) in the FAQ after all this discussion?  I could probably do
it, too (the original entry is mine), but i had to quote your
arguments only anyway.

> Also (and I think this is more likely to be the problem you ran
> into) many newer PC's are looking at the partition tables for a
> suspend-to-disk partition or a FAT filesystem with a suspend-to-disk
> dump file.

Seems i really love my Toshiba (Libretto) that simply hibernates to
the last nnn MB of the physical disk. ;-)  (I have reserved a FreeBSD
partition as a placeholder for the hibernation data.)

> However, there is light at the end of the tunnel.  EFI GPT is pretty
> clean.

Good to hear.  While this sounds like dedicated disks will be gone
then :), at least the format looks rationale enough.

> It supports up to something like 16384 partitions ...

It would be interesting to see how Windoze will arrange for 16K
"drive" letters. :-))

The day vinum is up and ready to also cover the root FS, i won't need
/any/ partition at all anymore. ;-)

As Greg Lehey wrote:

> > ...73 of those silly messages are just beyond any form of usefulness.

> Hadn't we agreed to do this?  I'm certainly in favour of the
> bootverbose approach.

I can't remember any agreement so far.  But thinking a bit more about
it, it sounds like the best solution to me, too.  The only other
useful option would be to restrict the message to once per drive, but
that'll cost an additional per-drive flag, which is probably too much
effort just for that message.

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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