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Date:      Tue, 7 Dec 2010 13:10:58 +0100
From:      Erik Trulsson <ertr1013@student.uu.se>
To:        Andriy Gapon <avg@freebsd.org>
Cc:        Bruce Cran <bruce@cran.org.uk>, src-committers@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org>, John Baldwin <jhb@freebsd.org>, svn-src-all@freebsd.org, Ivan Voras <ivoras@freebsd.org>, svn-src-head@freebsd.org, Alexander Motin <mav@freebsd.org>
Subject:   Re: svn commit: r216230 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
Message-ID:  <20101207121058.GA53449@owl.midgard.homeip.net>
In-Reply-To: <4CFE2110.8020108@freebsd.org>
References:  <AANLkTine9rGq_cM4ruFXYq=-F7cMXcQAr-zKHuWoQs2z@mail.gmail.com> <20101206195327.GD1936@garage.freebsd.pl> <201012061518.49835.jhb@freebsd.org> <4CFD514E.8010103@FreeBSD.org> <20101207095137.GC1700@garage.freebsd.pl> <4CFE0B9E.3060808@FreeBSD.org> <20101207110410.GE1700@garage.freebsd.pl> <4CFE1B0F.90908@FreeBSD.org> <20101207115106.GB68479@muon.cran.org.uk> <4CFE2110.8020108@freebsd.org>

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On Tue, Dec 07, 2010 at 01:57:04PM +0200, Andriy Gapon wrote:
> on 07/12/2010 13:51 Bruce Cran said the following:
> > On Tue, Dec 07, 2010 at 01:31:27PM +0200, Alexander Motin wrote:
> >> Not necessary. Some places indeed may have some legacy requirements,
> >> for example, in theory MBR want partition to be aligned to "track
> >> boundary" (but I've seen many pre-formatted SD cards with MBR
> >> violating it to align partition to flash sector). Same time for BSD
> >> label I see no problem to align partitions any way we want. I also
> >> see no problems to make FAT cluster, UFS block/fragment, etc, to
> >> match some sizes.
> > 
> >>From a new installation of Windows 7 and FreeBSD CURRENT:
> > 
> > GEOM: ada0: partition 3 does not start on a track boundary.
> > GEOM: ada0: partition 3 does not end on a track boundary.
> > GEOM: ada0: partition 2 does not start on a track boundary.
> > GEOM: ada0: partition 2 does not end on a track bounary.
> > 
> > Partition 2 is the reserved partition while 3 is an NTFS partition, both
> > created in the Windows setup application.
> > 
> > Since Windows isn't bothering to align partitions do we still need to
> > warn about it?
> > 
> 
> No.
> And another reason is that modern drives do not actually report any CHS
> parameters, so I don't even know where we get them and how we (pretend to) know
> we track boundaries are.

Modern drives do actually report CHS parameters.  The values reported
rarely (if ever) have any relationship whatsoever to reality, but they
are reported.  I guess the reason for them still being reported is to
satisfy old systems that do not undestand LBA and insist on getting CHS
parameters.



-- 
<Insert your favourite quote here.>
Erik Trulsson
ertr1013@student.uu.se



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