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Date:      Fri, 10 Dec 2010 10:42:05 +0200
From:      Andriy Gapon <avg@freebsd.org>
To:        Erik Trulsson <ertr1013@student.uu.se>
Cc:        Bruce Cran <bruce@cran.org.uk>, src-committers@freebsd.org, svn-src-all@freebsd.org, Bruce Evans <brde@optusnet.com.au>, Bruce Cran <brucec@freebsd.org>, svn-src-head@freebsd.org, Matthew Jacob <mj@feral.com>
Subject:   Re: svn commit: r216269 - head/sys/geom/part
Message-ID:  <4D01E7DD.8050904@freebsd.org>
In-Reply-To: <20101210011022.GB68703@owl.midgard.homeip.net>
References:  <201012072046.oB7KkB4L079555@svn.freebsd.org> <4CFEAD09.30904@freebsd.org> <4CFEAFA6.4020103@feral.com> <4CFEB1AD.70906@freebsd.org> <20101208153857.H1428@besplex.bde.org> <20101208225235.501ced0e@core.draftnet> <20101209191657.B1400@besplex.bde.org> <20101209221458.42448075@core.draftnet> <4D015A09.7070608@freebsd.org> <20101210011022.GB68703@owl.midgard.homeip.net>

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on 10/12/2010 03:10 Erik Trulsson said the following:
> On Fri, Dec 10, 2010 at 12:36:57AM +0200, Andriy Gapon wrote:
>> on 10/12/2010 00:14 Bruce Cran said the following:
>>> Since it appears that disks are still using the CHS fields despite
>>> having been obsolete since ATA-7 I guess it makes sense to continue
>>> printing them.

Label1:

>> I apologize for repeating myself, that probably starts to be annoying...
>> We read some reserved/unused/obsolete bytes and get some garbage in them.
>> The fact that the garbage looks like "valid" (for some definition of "valid")
>> CHS parameters doesn't mean that those are really valid, or CHS parameters, or
>> we should use them, or we should even report them, even for debug.
>> That's my personal position and I am sticking to it :-)
> 
> 
> No. Those bytes may be obsolete, and might be reserved by the latest
> version(s) of the ATA standard, but they are not unused and they do not
> contain garbage.  They do contain CHS parameters as set by the drive
> manufacturers, and should continue to be reported as such by the tools
> we have that provide disk information.

So, your personal belief/interpretation against mine, fair enough.
Can't add anything except go to $Label1.
:-)

-- 
Andriy Gapon



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